- 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
- 39Majestic Hotel Cardiff
- 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 Harvester
- 93Maple Restaurant & Bar
- 94Marco Pierre White Steakhouse Birmingham
- 95Marco's at the Old Red Lion
- 96Marco's New York Italian Birmingham Airport
- 97Marco's New York Italian Sheffield
- 98Mare & Colt
- 99Marine Hotel Llandudno
- 100Marine Hotel Paignton
- 101Mariners Court Leigh-on-Sea
- 102Maritime Museum Liverpool
- 103Market Halls - Canary Wharf
- 104Market Halls - Oxford Street
- 105Market Halls - Paddington
- 106Market Halls - Victoria
- 107Market House
- 108Market Rasen Racecourse
- 109Market Rasen/Rowley Mile Racecourse
- 110Market Tavern
- 111Marlborough Arms
- 112Marlborough Head
- 113Marlborough Tavern Bath
- 114Marquis of Granby
- 115Marsh Farm Hotel
- 116Martin's Bar and Restaurant Bridport
- 117Marton Mere Holiday Village
- 118Marwell Hotel
- 119Mary Janes Bar
- 120Marylebone Cricket Club
- 121MASH London
- 122Masons Arms, Ramsbottom
- 123Master Mariner
- 124Match Bar
- 125Maxwell’s Bar & Grill
- 126Maybush Inn
- 127Mayflower Hotel
- 128Mayfly, Folkestone
- 129Maze Gordon Ramsay
- 130Maze Grill Gordon Ramsay
- 131Meadow Farm, Redditch
- 132Mentmore Golf & Country Club
- 133Meon Valley Hotel & Country Club
- 134Meon Valley Marriott Hotel & Country Club
- 135Mercedes-Benz World
- 136Mercure Aberdeen Caledonian Hotel
- 137Mercure Altrincham Bowdon Hotel
- 138Mercure Ayr Hotel
- 139Mercure Bedford Centre Hotel
- 140Mercure Bewdley the Heath Hotel, Kidderminster
- 141Mercure Birmingham West Hotel
- 142Mercure Blackburn Dunkenhalgh Hotel and Spa
- 143Mercure Blackburn Foxfields Country Hotel
- 144Mercure Bolton Georgian House Hotel
- 145Mercure Bournemouth Queens Hotel & Spa
- 146Mercure Bradford, Bankfield Hotel
- 147Mercure Bridgwater Hotel
- 148Mercure Brighton Seafront Hotel
- 149Mercure Bristol Brigstow Hotel
- 150Mercure Bristol Holland House Hotel
- 151Mercure Bristol North, The Grange Hotel
- 152Mercure Cardiff North Hotel
- 153Mercure Chester Abbots Well Hotel
- 154Mercure Darlington Kings Hotel
- 155Mercure Dartford Brands Hatch Hotel and Spa
- 156Mercure Daventry Court Hotel
- 157Mercure Dorking White Horse Hotel
- 158Mercure Exeter Southgate Hotel
- 159Mercure Exeter Southgate Hotel
- 160Mercure George Hotel Reading
- 161Mercure Glasgow City Hotel
- 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
- 207MERKUR Casino Milton Keynes
- 208Merlins Cave
- 209Merrie Garden, Sandown
- 210Merrie Harrier
- 211Merrist Wood Golf Club
- 212Metropolitan Bushey
- 213Mews of Mayfair
- 214Mharsanta Restaurant & Bar
- 215MIC Hotel and Conference Centre
- 216Middlemore Farm, Daventry
- 217Middlethorpe Hall & Spa
- 218Middletons Hotel
- 219Milford Golf Club
- 220Mill Farm, Cannock
- 221Mill Green Golf Club
- 222Mill Hotel
- 223Mill Inn
- 224Mill Rythe Holiday Village
- 225Millennium Gloucester Hotel London Kensington
- 226Millennium Hotel London Knightsbridge
- 227Millennium Point
- 228Millennium Stadium
- 229Millers Bar and Restaurant
- 230Millers Hotel, Sibson
- 231Millstone at Mellor
- 232Milnes Bar
- 233Milton Hill House
- 234Ministry of Sound
- 235Mint Leaf Lounge & Restaurant
- 236Mint Leaf Restaurant & Bar
- 237Mitcham Golf Club
- 238Mitton Hall
- 239MK Dons Football Club
- 240Moddershall Oaks Country Spa Retreat
- 241Modello Yeovil
- 242Modern Life Cafe
- 243Moka Crawley
- 244Moka Lincoln
- 245Molineux Stadium – Wolverhampton Wanderers FC
- 246Momo
- 247Monachty
- 248Monkey Island Estate
- 249Monkfield Arms, Cambourne
- 250Moon & Sixpence
- 251Moor Park Mansion
- 252Moot House Social Club
- 253Morden Brook
- 254Morden Hall
- 255More Bar and Brasserie
- 256Morecambe Football Club
- 257Morganians Rugby Football Club Bridgwater
- 258Mosborough Hall Hotel Sheffield
- 259Mosimann's
- 260Motcombs Restaurant
- 261Moti Mahal Restaurant
- 262Motley Manchester
- 263Motorpoint Arena Cardiff
- 264Motown Manchester at Mercure Manchester Piccadilly
- 265Mottram Hall
- 266Mount Pleasant Ecological Park
- 267Mount Royal Hotel Edinburgh
- 268Mour Hotel
- 269Movida London
- 270Moyse's Hall
- 271Moyse's Hall
- 272Mozzarella Joes
- 273Mr Mulligans Birmingham
- 274Mr Mulligans Bournemouth
- 275Mr Mulligans Cheltenham
- 276Mr Mulligans Milton Keynes
- 277Mr Mulligans Newcastle
- 278Mr Mulligans Stevenage
- 279MSI - Museum of Science and Industry
- 280Mulberry
- 281Mulberry Bush
- 282Mulberry House
- 283Municipal Hotel Liverpool - MGallery
- 284Murano Restaurant
- 285Murrayfield Stadium
- 286Murraypark Hotel
- 287Murrayshall Hotel & Golf Courses
- 288Museum & Art Gallery on The Strand
- 289Museum & Art Gallery on The Wardwick
- 290Museum of Liverpool
- 291Museum Of London
- 292Museum Of London Docklands
- 293Museum of Making at Derby Silk Mill
- 294Museum of The Order of St John
- 295Museum Tavern
- 296MusicRoomSpaceEvents
- 297Mustard Bar, Lounge & Restaurant
- 298Muthu Belstead Brook Hotel
- 299Muthu Clumber Park Hotel & Spa
- 300Muthu Glasgow River Hotel
- 301Muthu Newton Hotel
- 302Muthu Westcliff Hotel
- 303myhotel Bloomsbury
- 304myhotel Brighton
- 305myhotel Chelsea
- 306Myton House Farm, Stockton On Tees