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