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