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