- 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 Tickled Trout Hotel
- 30Macdonald Windsor Hotel
- 31Machynys Peninsula Golf Club & Premier Spa
- 32Mackintosh at the Willow
- 33Madame Tussauds London
- 34Maddox Club
- 35Madison Restaurant Bar & Cafe
- 36Maenllwyd Inn
- 37Maesmawr Hall Hotel
- 38Magazine London
- 39Magicians.co.uk
- 40Magna Events
- 41Maidens Tower at Leeds Castle
- 42Majestic Hotel Eastbourne
- 43Makeney Hall Hotel
- 44Mallory Court Country House Hotel & Spa
- 45Mallyan Spout Hotel
- 46Malmaison Aberdeen
- 47Malmaison Belfast
- 48Malmaison Birmingham
- 49Malmaison Brighton
- 50Malmaison Dundee
- 51Malmaison Edinburgh
- 52Malmaison Glasgow
- 53Malmaison Leeds
- 54Malmaison Liverpool
- 55Malmaison Manchester
- 56Malmaison Newcastle
- 57Malmaison Oxford
- 58Malmaison Reading
- 59Malmaison York
- 60Malt House
- 61Malt Shovel Inn
- 62Malthouse Farm
- 63Maltsters Arms
- 64Maltsters, Llandaff
- 65Maltsters, Whitchurch
- 66Manahatta Deansgate - Manchester
- 67Manahatta Edinburgh
- 68Manahatta Greek Street - Leeds
- 69Manahatta Headingley - Leeds
- 70Manahatta Merrion Street - Leeds
- 71Manahatta Newcastle
- 72Manahatta Nottingham
- 73Manahatta Parliament Street - Harrogate
- 74Manahatta Sheffield
- 75Manahatta Temple Street - Birmingham
- 76Manahatta York
- 77Manchester Airport Stanley Hotel | Signature Collection by Best Western
- 78Manchester Marriott Piccadilly Hotel
- 79Manchester Marriott Victoria & Albert Hotel
- 80Manchester South Hotel | Sure Collection by Best Western
- 81Manchester United Football Club - Old Trafford
- 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
- 108Marsden Manor Gloucestershire
- 109Marsh Farm Hotel
- 110Marton Mere Holiday Village
- 111Marwell Hotel
- 112Mary Janes Bar
- 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 Box Hill Burford Bridge Hotel
- 139Mercure Bradford, Bankfield Hotel
- 140Mercure Brandon Hall Hotel & Spa, Warwickshire
- 141Mercure Bridgwater Hotel
- 142Mercure Brighton Seafront Hotel
- 143Mercure Bristol Brigstow Hotel
- 144Mercure Bristol Grand Hotel
- 145Mercure Bristol Holland House Hotel
- 146Mercure Bristol North, The Grange Hotel
- 147Mercure Cardiff Holland House Hotel and Spa
- 148Mercure Cardiff North Hotel
- 149Mercure Chester Abbots Well Hotel
- 150Mercure Chester North Woodhey House Hotel
- 151Mercure Darlington Kings Hotel
- 152Mercure Dartford Brands Hatch Hotel and Spa
- 153Mercure Daventry Court Hotel
- 154Mercure Dorking White Horse Hotel
- 155Mercure Edinburgh City - Princes Street Hotel
- 156Mercure Exeter Rougemont 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 Hythe Imperial Hotel & Spa
- 168Mercure Inverness Hotel
- 169Mercure Leeds Parkway Hotel
- 170Mercure Liverpool Atlantic Tower Hotel
- 171Mercure Livingston Hotel
- 172Mercure London Bloomsbury
- 173Mercure London Bridge Hotel
- 174Mercure London City Bankside
- 175Mercure London Hyde Park
- 176Mercure London Kensington
- 177Mercure London Paddington
- 178Mercure London Staines Upon Thames Hotel
- 179Mercure Maidstone Great Danes Hotel
- 180Mercure Manchester Norton Grange Hotel and Spa
- 181Mercure Manchester Piccadilly Hotel
- 182Mercure Milton Keynes Hotel
- 183Mercure Milton Keynes Hotel
- 184Mercure Newbury Elcot Park Hotel
- 185Mercure Northampton Town Centre
- 186Mercure Norton Grange Hotel & Spa
- 187Mercure Norwich Hotel
- 188Mercure Nottingham Sherwood Hotel
- 189Mercure Oxford Eastgate Hotel
- 190Mercure Oxford Hawkwell House
- 191Mercure Paignton Hotel
- 192Mercure Perth Hotel
- 193Mercure Salisbury White Hart Hotel
- 194Mercure Sheffield Kenwood Hall & Spa
- 195Mercure Sheffield Parkway Hotel
- 196Mercure Sheffield St Paul's Hotel and Spa
- 197Mercure Shrewsbury Albrighton Hall Hotel and Spa
- 198Mercure Southampton Centre Dolphin Hotel
- 199Mercure St Albans Noke Hotel
- 200Mercure Stafford South Hatherton House Hotel
- 201Mercure Stratford-upon-Avon Shakespeare Hotel
- 202Mercure Swansea
- 203Mercure Tankersley Manor
- 204Mercure Telford Centre Hotel
- 205Mercure Telford Madeley Court Hotel
- 206Mercure Tunbridge Wells Hotel
- 207Mercure Warwickshire Walton Hall Hotel
- 208Mercure Wetherby Hotel
- 209Mercure Winchester Wessex Hotel
- 210Mercure York Fairfield Manor Hotel
- 211Mere Court Hotel & Conference Centre
- 212Merlins Cave
- 213Merrie Garden, Sandown
- 214Merrie Harrier
- 215Merrist Wood Golf Club
- 216Metropolitan Bushey
- 217Mews of Mayfair
- 218Mharsanta Restaurant & Bar
- 219MIC Hotel and Conference Centre
- 220Middlemore Farm, Daventry
- 221Middlethorpe Hall & Spa
- 222Middletons Hotel
- 223Milford Golf Club
- 224Mill Farm, Cannock
- 225Mill Green Golf Club
- 226Mill Hotel
- 227Mill Inn
- 228Mill Rythe Holiday Village
- 229Millennium Gloucester Hotel London Kensington
- 230Millennium Hotel London Knightsbridge
- 231Millennium Point
- 232Millennium Stadium
- 233Millers Bar and Restaurant
- 234Millers Hotel, Sibson
- 235Millstone at Mellor
- 236Milnes Bar
- 237Milton Hill House
- 238Ministry of Sound
- 239Minster Mill
- 240Mint Leaf Lounge & Restaurant
- 241Mint Leaf Restaurant & Bar
- 242Missenden Abbey
- 243Mitton Hall
- 244MKM Stadium - Tiger Events - Hull Tigers
- 245Moddershall Oaks Country Spa Retreat
- 246Modello Yeovil
- 247Modern Life Cafe
- 248Moka Crawley
- 249Moka Lincoln
- 250Molineux Stadium – Wolverhampton Wanderers FC
- 251Momo
- 252Monachty
- 253Monkey Island Estate
- 254Monkfield Arms, Cambourne
- 255Moon & Sixpence
- 256Moor Park Mansion
- 257Moot House Social Club
- 258Morden Hall
- 259More Bar and Brasserie
- 260Morecambe FC - Globe Arena
- 261Mosborough Hall Hotel
- 262Mosimann's
- 263Motcombs Restaurant
- 264Moti Mahal Restaurant
- 265Motley Manchester
- 266Motorpoint Arena Cardiff
- 267Mottram Hall
- 268Mount Pleasant Ecological Park
- 269Mour Hotel
- 270Movida London
- 271Moyse's Hall
- 272Moyse's Hall
- 273Mozzarella Joes
- 274Mr Mulligans Birmingham
- 275Mr Mulligans Bournemouth
- 276Mr Mulligans Cheltenham
- 277Mr Mulligans Milton Keynes
- 278Mr Mulligans Newcastle
- 279Mr Mulligans Stevenage
- 280MSI - Museum of Science and Industry
- 281Mulberry
- 282Mulberry Bush
- 283Mulberry House
- 284Mundy Arms
- 285Municipal Hotel Liverpool - MGallery
- 286Murano Restaurant
- 287Murraypark Hotel
- 288Murrayshall Hotel & Golf Courses
- 289Museum & Art Gallery on The Strand
- 290Museum & Art Gallery on The Wardwick
- 291Museum of Liverpool
- 292Museum Of London
- 293Museum Of London Docklands
- 294Museum of Making at Derby Silk Mill
- 295Museum of The Order of St John
- 296Museum Tavern
- 297MusicRoomSpaceEvents
- 298Mustard Bar, Lounge & Restaurant
- 299Muthu Belstead Brook Hotel
- 300Muthu Clumber Park Hotel & Spa
- 301Muthu Glasgow River Hotel
- 302Muthu Newton Hotel
- 303Muthu Westcliff Hotel
- 304myhotel Bloomsbury
- 305myhotel Brighton
- 306myhotel Chelsea
- 307Myton House Farm, Stockton On Tees