- 1M by Montcalm
- 2M Shed
- 3M40 J15 Warwick Hotel
- 4Macdonald Alveston Manor Hotel
- 5Macdonald Aviemore Resort
- 6Macdonald Bath Spa Hotel
- 7Macdonald Bear Hotel
- 8Macdonald Berystede Hotel
- 9Macdonald Botley Park Hotel
- 10Macdonald Burlington Hotel
- 11Macdonald Cardrona Hotel Golf & Spa
- 12Macdonald Compleat Angler
- 13Macdonald Craxton Wood Hotel
- 14Macdonald Crutherland House
- 15Macdonald Drumossie Hotel
- 16Macdonald Elmers Court Hotel & Resort
- 17Macdonald Frimley Hall Hotel & Spa
- 18Macdonald Hill Valley Hotel Golf & Spa
- 19Macdonald Houstoun House
- 20Macdonald Inchyra Hotel & Spa
- 21Macdonald Kilhey Court
- 22Macdonald Leeming House
- 23Macdonald Linden Hall Hotel
- 24Macdonald New Blossoms Hotel
- 25Macdonald Norwood Hall Hotel
- 26Macdonald Old England Hotel & Spa
- 27Macdonald Pittodrie House
- 28Macdonald Portal Hotel, Golf & Spa
- 29Macdonald Tickled Trout Hotel
- 30Macdonald Windsor Hotel
- 31Machynys Peninsula Golf Club & Premier Spa
- 32Mackintosh at the Willow
- 33Madame Tussauds London
- 34Maddox Club
- 35Madison Restaurant Bar & Cafe
- 36Maenllwyd Inn
- 37Maesmawr Hall Hotel
- 38Magazine London
- 39Magicians.co.uk
- 40Magna Events
- 41Maidens Tower at Leeds Castle
- 42Majestic Hotel Eastbourne
- 43Makeney Hall Hotel
- 44Mallory Court Country House Hotel & Spa
- 45Mallyan Spout Hotel
- 46Malmaison Aberdeen
- 47Malmaison Belfast
- 48Malmaison Birmingham
- 49Malmaison Brighton
- 50Malmaison Dundee
- 51Malmaison Edinburgh
- 52Malmaison Glasgow
- 53Malmaison Leeds
- 54Malmaison Liverpool
- 55Malmaison Manchester
- 56Malmaison Newcastle
- 57Malmaison Oxford
- 58Malmaison Reading
- 59Malmaison York
- 60Malt House
- 61Malt Shovel Inn
- 62Malthouse Farm
- 63Maltsters Arms
- 64Maltsters, Llandaff
- 65Maltsters, Whitchurch
- 66Manahatta Deansgate - Manchester
- 67Manahatta Edinburgh
- 68Manahatta Greek Street - Leeds
- 69Manahatta Headingley - Leeds
- 70Manahatta Merrion Street - Leeds
- 71Manahatta Newcastle
- 72Manahatta Nottingham
- 73Manahatta Parliament Street - Harrogate
- 74Manahatta Sheffield
- 75Manahatta Temple Street - Birmingham
- 76Manahatta York
- 77Manchester Airport Stanley Hotel | Signature Collection by Best Western
- 78Manchester Marriott Piccadilly Hotel
- 79Manchester Marriott Victoria & Albert Hotel
- 80Manchester South Hotel | Sure Collection by Best Western
- 81Manchester United Football Club - Old Trafford
- 82Manchester United Women's Football Club
- 83Manchester235
- 84Mandarin Oriental Hyde Park
- 85Mandeville Hotel
- 86Mango Tree
- 87Manor By The Lake
- 88Manor Farm, Worcester
- 89Manor House Hotel
- 90Mansion House Edinburgh Zoo
- 91Mansion House Harvester
- 92Maple Restaurant & Bar
- 93Marco Pierre White Steakhouse Birmingham
- 94Marco's at the Old Red Lion
- 95Marco's New York Italian Birmingham Airport
- 96Marco's New York Italian Sheffield
- 97Mare & Colt
- 98Marine Hotel Llandudno
- 99Marine Hotel Paignton
- 100Maritime Museum Liverpool
- 101Market House
- 102Market Rasen Racecourse
- 103Market Rasen/Rowley Mile Racecourse
- 104Market Tavern
- 105Marks Tey Hotel
- 106Marlborough Arms
- 107Marlborough Head
- 108Marquis of Granby
- 109Marsden Manor Gloucestershire
- 110Marsh Farm Hotel
- 111Marton Mere Holiday Village
- 112Marwell Hotel
- 113Mary Janes Bar
- 114Marylebone Cricket Club
- 115MASH London
- 116Masons Arms, Ramsbottom
- 117Master Mariner
- 118Match Bar
- 119Maxwell’s Bar & Grill
- 120Maybush Inn
- 121Mayflower Hotel
- 122Mayfly, Folkestone
- 123Maze Gordon Ramsay
- 124Maze Grill Gordon Ramsay
- 125Meadow Farm, Redditch
- 126Mentmore Golf & Country Club
- 127Meon Valley Hotel & Country Club
- 128Meon Valley Marriott Hotel & Country Club
- 129Mercedes-Benz World
- 130Mercure Aberdeen Caledonian Hotel
- 131Mercure Altrincham Bowdon Hotel
- 132Mercure Ayr Hotel
- 133Mercure Bedford Centre Hotel
- 134Mercure Bewdley the Heath Hotel, Kidderminster
- 135Mercure Birmingham West Hotel
- 136Mercure Blackburn Dunkenhalgh Hotel and Spa
- 137Mercure Blackburn Foxfields Country Hotel
- 138Mercure Bolton Georgian House Hotel
- 139Mercure Bournemouth Queens Hotel & Spa
- 140Mercure Box Hill Burford Bridge Hotel
- 141Mercure Bradford, Bankfield Hotel
- 142Mercure Brandon Hall Hotel & Spa, Warwickshire
- 143Mercure Bridgwater Hotel
- 144Mercure Brighton Seafront Hotel
- 145Mercure Bristol Brigstow Hotel
- 146Mercure Bristol Grand Hotel
- 147Mercure Bristol Holland House Hotel
- 148Mercure Bristol North, The Grange Hotel
- 149Mercure Cardiff Holland House Hotel and Spa
- 150Mercure Cardiff North Hotel
- 151Mercure Chester Abbots Well Hotel
- 152Mercure Chester North Woodhey House Hotel
- 153Mercure Darlington Kings Hotel
- 154Mercure Dartford Brands Hatch Hotel and Spa
- 155Mercure Daventry Court Hotel
- 156Mercure Dorking White Horse Hotel
- 157Mercure Edinburgh City - Princes Street Hotel
- 158Mercure Exeter Rougemont Hotel
- 159Mercure Exeter Southgate Hotel
- 160Mercure Farnham Bush Hotel
- 161Mercure George Hotel Reading
- 162Mercure Glasgow City Hotel
- 163Mercure Gloucester, Bowden Hall Hotel
- 164Mercure Hatfield Oak Hotel
- 165Mercure Haydock Hotel
- 166Mercure Hotel Newport
- 167Mercure Hotel Nottingham City Centre
- 168Mercure Hull Grange Park Hotel
- 169Mercure Hythe Imperial Hotel & Spa
- 170Mercure Inverness Hotel
- 171Mercure Leeds Parkway Hotel
- 172Mercure Liverpool Atlantic Tower Hotel
- 173Mercure Livingston Hotel
- 174Mercure London Bloomsbury
- 175Mercure London Bridge Hotel
- 176Mercure London City Bankside
- 177Mercure London Hyde Park
- 178Mercure London Kensington
- 179Mercure London Paddington
- 180Mercure London Staines Upon Thames Hotel
- 181Mercure Maidstone Great Danes Hotel
- 182Mercure Manchester Norton Grange Hotel and Spa
- 183Mercure Manchester Piccadilly Hotel
- 184Mercure Milton Keynes Hotel
- 185Mercure Milton Keynes Hotel
- 186Mercure Newbury Elcot Park Hotel
- 187Mercure Northampton Town Centre
- 188Mercure Norton Grange Hotel & Spa
- 189Mercure Norwich Hotel
- 190Mercure Nottingham Sherwood Hotel
- 191Mercure Oxford Eastgate Hotel
- 192Mercure Oxford Hawkwell House
- 193Mercure Paignton Hotel
- 194Mercure Perth Hotel
- 195Mercure Salisbury White Hart Hotel
- 196Mercure Sheffield Kenwood Hall & Spa
- 197Mercure Sheffield Parkway Hotel
- 198Mercure Sheffield St Paul's Hotel and Spa
- 199Mercure Shrewsbury Albrighton Hall Hotel and Spa
- 200Mercure St Albans Noke Hotel
- 201Mercure Stafford South Hatherton House Hotel
- 202Mercure Stratford-upon-Avon Shakespeare Hotel
- 203Mercure Swansea
- 204Mercure Tankersley Manor
- 205Mercure Telford Centre Hotel
- 206Mercure Telford Madeley Court Hotel
- 207Mercure Tunbridge Wells Hotel
- 208Mercure Warwickshire Walton Hall Hotel
- 209Mercure Wetherby Hotel
- 210Mercure Winchester Wessex Hotel
- 211Mercure York Fairfield Manor Hotel
- 212Mere Court Hotel & Conference Centre
- 213Merlins Cave
- 214Merrie Garden, Sandown
- 215Merrie Harrier
- 216Merrist Wood Golf Club
- 217Metropolitan Bushey
- 218Mews of Mayfair
- 219Mharsanta Restaurant & Bar
- 220MIC Hotel and Conference Centre
- 221Middlemore Farm, Daventry
- 222Middlethorpe Hall & Spa
- 223Middletons Hotel
- 224Milford Golf Club
- 225Mill Farm, Cannock
- 226Mill Green Golf Club
- 227Mill Hotel
- 228Mill Inn
- 229Mill Rythe Holiday Village
- 230Millennium Gloucester Hotel London Kensington
- 231Millennium Hotel London Knightsbridge
- 232Millennium Point
- 233Millennium Stadium
- 234Millers Bar and Restaurant
- 235Millers Hotel, Sibson
- 236Millstone at Mellor
- 237Milnes Bar
- 238Milton Hill House
- 239Ministry of Sound
- 240Minster Mill
- 241Mint Leaf Lounge & Restaurant
- 242Mint Leaf Restaurant & Bar
- 243Missenden Abbey
- 244Mitton Hall
- 245MK Dons Football Club
- 246Moddershall Oaks Country Spa Retreat
- 247Modello Yeovil
- 248Modern Life Cafe
- 249Moka Crawley
- 250Moka Lincoln
- 251Molineux Stadium – Wolverhampton Wanderers FC
- 252Momo
- 253Monachty
- 254Monkey Island Estate
- 255Monkfield Arms, Cambourne
- 256Moon & Sixpence
- 257Moor Park Mansion
- 258Moot House Social Club
- 259Morden Hall
- 260More Bar and Brasserie
- 261Morecambe Football Club
- 262Mosborough Hall Hotel
- 263Mosimann's
- 264Motcombs Restaurant
- 265Moti Mahal Restaurant
- 266Motley Manchester
- 267Motorpoint Arena Cardiff
- 268Mottram Hall
- 269Mount Pleasant Ecological Park
- 270Mour Hotel
- 271Movida London
- 272Moyse's Hall
- 273Moyse's Hall
- 274Mozzarella Joes
- 275Mr Mulligans Birmingham
- 276Mr Mulligans Bournemouth
- 277Mr Mulligans Cheltenham
- 278Mr Mulligans Milton Keynes
- 279Mr Mulligans Newcastle
- 280Mr Mulligans Stevenage
- 281MSI - Museum of Science and Industry
- 282Mulberry
- 283Mulberry Bush
- 284Mulberry House
- 285Mundy Arms
- 286Municipal Hotel Liverpool - MGallery
- 287Murano Restaurant
- 288Murrayfield Stadium
- 289Murraypark Hotel
- 290Murrayshall Hotel & Golf Courses
- 291Museum & Art Gallery on The Strand
- 292Museum & Art Gallery on The Wardwick
- 293Museum of Liverpool
- 294Museum Of London
- 295Museum Of London Docklands
- 296Museum of Making at Derby Silk Mill
- 297Museum of The Order of St John
- 298Museum Tavern
- 299MusicRoomSpaceEvents
- 300Mustard Bar, Lounge & Restaurant
- 301Muthu Belstead Brook Hotel
- 302Muthu Clumber Park Hotel & Spa
- 303Muthu Glasgow River Hotel
- 304Muthu Newton Hotel
- 305Muthu Westcliff Hotel
- 306myhotel Bloomsbury
- 307myhotel Brighton
- 308myhotel Chelsea
- 309Myton House Farm, Stockton On Tees
