- 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
- 111Marlborough Tavern Bath
- 112Marquis of Granby
- 113Marsh Farm Hotel
- 114Martin's Bar and Restaurant Bridport
- 115Marton Mere Holiday Village
- 116Marwell Hotel
- 117Mary Janes Bar
- 118Marylebone Cricket Club
- 119MASH London
- 120Masons Arms, Ramsbottom
- 121Master Mariner
- 122Match Bar
- 123Maxwell’s Bar & Grill
- 124Maybush Inn
- 125Mayflower Hotel
- 126Mayfly, Folkestone
- 127Maze Gordon Ramsay
- 128Maze Grill Gordon Ramsay
- 129Meadow Farm, Redditch
- 130Mentmore Golf & Country Club
- 131Meon Valley Hotel & Country Club
- 132Meon Valley Marriott Hotel & Country Club
- 133Mercedes-Benz World
- 134Mercure Aberdeen Caledonian Hotel
- 135Mercure Altrincham Bowdon Hotel
- 136Mercure Ayr Hotel
- 137Mercure Bedford Centre Hotel
- 138Mercure Bewdley the Heath Hotel, Kidderminster
- 139Mercure Birmingham West Hotel
- 140Mercure Blackburn Dunkenhalgh Hotel and Spa
- 141Mercure Blackburn Foxfields Country Hotel
- 142Mercure Bolton Georgian House Hotel
- 143Mercure Bournemouth Queens Hotel & Spa
- 144Mercure Bradford, Bankfield Hotel
- 145Mercure Brandon Hall Hotel & Spa, Warwickshire
- 146Mercure Bridgwater Hotel
- 147Mercure Brighton Seafront Hotel
- 148Mercure Bristol Brigstow Hotel
- 149Mercure Bristol Holland House Hotel
- 150Mercure Bristol North, The Grange Hotel
- 151Mercure Cardiff North Hotel
- 152Mercure Chester Abbots Well Hotel
- 153Mercure Darlington Kings Hotel
- 154Mercure Dartford Brands Hatch Hotel and Spa
- 155Mercure Daventry Court Hotel
- 156Mercure Dorking White Horse Hotel
- 157Mercure Exeter Southgate Hotel
- 158Mercure Farnham Bush Hotel
- 159Mercure George Hotel Reading
- 160Mercure Glasgow City Hotel
- 161Mercure Gloucester, Bowden Hall Hotel
- 162Mercure Hatfield Oak Hotel
- 163Mercure Haydock Hotel
- 164Mercure Hotel Newport
- 165Mercure Hotel Nottingham City Centre
- 166Mercure Hull Grange Park Hotel
- 167Mercure Inverness Hotel
- 168Mercure Leeds Parkway Hotel
- 169Mercure Livingston Hotel
- 170Mercure London Bloomsbury
- 171Mercure London Bridge Hotel
- 172Mercure London City Bankside
- 173Mercure London Hyde Park
- 174Mercure London Kensington
- 175Mercure London Paddington
- 176Mercure Maidstone Great Danes Hotel
- 177Mercure Manchester Norton Grange Hotel and Spa
- 178Mercure Manchester Piccadilly Hotel
- 179Mercure Milton Keynes Hotel
- 180Mercure Milton Keynes Hotel
- 181Mercure Newbury Elcot Park Hotel
- 182Mercure Northampton Town Centre
- 183Mercure Norton Grange Hotel & Spa
- 184Mercure Norwich Hotel
- 185Mercure Nottingham Sherwood Hotel
- 186Mercure Oxford Eastgate Hotel
- 187Mercure Oxford Hawkwell House
- 188Mercure Paignton Hotel
- 189Mercure Perth Hotel
- 190Mercure Salisbury White Hart Hotel
- 191Mercure Sheffield Kenwood Hall & Spa
- 192Mercure Sheffield Parkway Hotel
- 193Mercure Sheffield St Paul's Hotel and Spa
- 194Mercure St Albans Noke Hotel
- 195Mercure Stafford South Hatherton House Hotel
- 196Mercure Stratford-upon-Avon Shakespeare Hotel
- 197Mercure Swansea
- 198Mercure Tankersley Manor
- 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
- 205Merlins Cave
- 206Merrie Garden, Sandown
- 207Merrie Harrier
- 208Merrist Wood Golf Club
- 209Metropolitan Bushey
- 210Mews of Mayfair
- 211Mharsanta Restaurant & Bar
- 212MIC Hotel and Conference Centre
- 213Middlemore Farm, Daventry
- 214Middlethorpe Hall & Spa
- 215Middletons Hotel
- 216Milford Golf Club
- 217Mill Farm, Cannock
- 218Mill Green Golf Club
- 219Mill Hotel
- 220Mill Inn
- 221Mill Rythe Holiday Village
- 222Millennium Gloucester Hotel London Kensington
- 223Millennium Hotel London Knightsbridge
- 224Millennium Point
- 225Millennium Stadium
- 226Millers Bar and Restaurant
- 227Millers Hotel, Sibson
- 228Millstone at Mellor
- 229Milnes Bar
- 230Milton Hill House
- 231Ministry of Sound
- 232Mint Leaf Lounge & Restaurant
- 233Mint Leaf Restaurant & Bar
- 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
- 252Morganians Rugby Football Club Bridgwater
- 253Mosborough Hall Hotel Sheffield
- 254Mosimann's
- 255Motcombs Restaurant
- 256Moti Mahal Restaurant
- 257Motley Manchester
- 258Motorpoint Arena Cardiff
- 259Motown Bristol at Delta Hotel by Marriott Bristol
- 260Motown Manchester at Hilton Manchester Deansgate
- 261Mottram Hall
- 262Mount Pleasant Ecological Park
- 263Mount Royal Hotel Edinburgh
- 264Mour Hotel
- 265Movida London
- 266Moyse's Hall
- 267Moyse's Hall
- 268Mozzarella Joes
- 269Mr Mulligans Birmingham
- 270Mr Mulligans Bournemouth
- 271Mr Mulligans Cheltenham
- 272Mr Mulligans Milton Keynes
- 273Mr Mulligans Newcastle
- 274Mr Mulligans Stevenage
- 275MSI - Museum of Science and Industry
- 276Mulberry
- 277Mulberry Bush
- 278Mulberry House
- 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