UK BBC and commercial radio stations containing M in the name:
3FM (Isle of Man) [3FM]
80s Rhythm [80R]
Ambition Radio [ABT]
Angel Radio (Chichester, Portsmouth & Havant) [AGH]
Argyll FM [ARG]
Atmosphere.Radio [ATM]
Atomix Radio [ATX]
Bailiwick Radio (formerly Bailiwick Radio Hits) [BWK]
BBC Radio 1 Anthems [B1A]
BBC Radio 6 Music [B6M]
BBC Radio Cambridgeshire [BCG]
BBC Radio Cumbria [BCM]
BBC Radio Cymru [BCY]
BBC Radio Cymru 2 [BC2]
BBC Radio Humberside [BHM]
BBC Radio Manchester [BMC]
BBC Radio Merseyside [BMS]
BBC Radio Northampton [BNH]
BBC Radio Nottingham [BNT]
BBC Radio Scotland (Network FM) [BSL]
BBC Radio Scotland (MW) [BSA]
BBC Radio Solent (South Hampshire, Isle of Wight & East Dorset) [BSC]
BBC Radio Somerset [BSS]
BBC Radio Wales (Network FM) [BWL]
BBC Radio Wales (MW) [BWA]
BBC Radio WM [BWM]
BCR, Blackpool Community Radio [BPL]
BFBS (Portsmouth) (CEASED) [BFP]
Bloomberg Radio [BLM]
Boom Light [BML]
Boom Radio [BOM]
Boom Rock (CEASED) [BMR]
Boomerang Radio [BMG]
Bournemouth One [BM1]
BRIDGEfm (Dundee) [BRD]
Bridge FM Radio (Bridgend) [BDG]
Capital (Birmingham) [CBH]
Capital (East Midlands) (Derbyshire) [CDB]
Capital (East Midlands) (Leicestershire) [CLS]
Capital (East Midlands) (Nottinghamshire) [CNT]
Capital (Manchester) [CMC]
Capital (Mid Counties) (Coventry) [CCV]
Capital (Mid Counties) (North Oxfordshire) [CBB]
Capital (Mid Counties) (Rugby) [CRG]
Capital (Mid Counties) (South East Staffordshire) [CBL]
Capital (Mid Counties) (Stratford-upon-Avon) [CSF]
Capital (Mid Counties) (Warwick) [CWK]
Capital (North West & North Wales) (Wrexham & Cheshire) [CWC]
Capital Anthems [CAN]
CDNX, Camden Xperience (CEASED) [CDX]
Central FM [CEN]
Classic FM [CLA]
Classic FM Calm [CCM]
Classic FM Christmas [CXM]
Classic FM Movies [CMV]
Coast and County Radio (Hull & East Yorkshire) (formerly Great Yorkshire Radio) [CAH]
Coast FM (Northern Ireland) (CEASED) [CSN]
Congregation Room 22 [C22]
Cool FM [COL]
DanceLand Anthems [DLA]
Durham OnAir [DUR]
Embrace [EMB]
Energy FM (Isle of Man) [ERG]
Gaydio (Birmingham) [GYB]
GB Music Radio [GBM]
Geronimo [GER]
GlitterBeam [GLT]
Greatest Hits Radio (Berkshire & North Hampshire) [GBH]
Greatest Hits Radio (Birmingham & the West Midlands) [GWM]
Greatest Hits Radio (Cambridgeshire) [GCG]
Greatest Hits Radio (Cumbria & South West Scotland) [GCM]
Greatest Hits Radio (Dorset) (Bournemouth & Poole) [GBP]
Greatest Hits Radio (East Midlands) [GEM]
Greatest Hits Radio (Manchester & the North West) [GMC]
Greatest Hits Radio (Northamptonshire) [GNH]
Greatest Hits Radio (Peterborough, Stamford & Rutland) [GSR]
Greatest Hits Radio (Plymouth) [GPM]
Greatest Hits Radio (Scotland) (Dumfries & Galloway) [GDG]
Greatest Hits Radio (Scotland) (Scottish Borders & North Northumberland) [GBD]
Greatest Hits Radio (Somerset) [GSS]
Greatest Hits Radio (Surrey & East Hampshire) [GSH]
Hamdosana Radio [HOS]
Hampshire Tourist Radio [HAT]
Heart (Cambridgeshire) [HCG]
Heart (Devon) (Plymouth) [HPM]
Heart (Devon) (South Hams) [HSH]
Heart (East Midlands) (Derbyshire) [HDB]
Heart (East Midlands) (Leicestershire) [HLS]
Heart (East Midlands) (Nottinghamshire) [HNT]
Heart (Essex) (Southend & Chelmsford) [HSC]
Heart (Hertfordshire) (Watford & Hemel) [HWH]
Heart (Lancashire & Cumbria) [HLC]
Heart (Milton Keynes) [HMK]
Heart (Northamptonshire) [HNH]
Heart (Somerset) [HSS]
Heart (South Coast) (Hampshire & West Sussex) [HHS]
Heart (Thames Valley) [HBK]
Heart (Wales) (North & Mid) [HWN]
Heart (West Midlands) [HWM]
Heart Musicals [HML]
Heart Xmas [HXM]
Heartland FM (CEASED) [HTL]
Heartland Radio (Manchester) [HLM]
Hits Radio (Berkshire & North Hampshire) [HBN]
Hits Radio (Birmingham) [HBH]
Hits Radio (Cambridgeshire) [HCB]
Hits Radio (County Durham, Northumberland and Tyne & Wear) [HNE]
Hits Radio (Cumbria & South West Scotland) [HCM]
Hits Radio (East Midlands) [HEM]
Hits Radio (Manchester) [HMC]
Hits Radio (Northamptonshire) [HNN]
Hope FM (UK) [HPA]
Illuminations Radio [ILL]
Imaan One [IM1]
Impact Digital Radio [IMP]
In Demand Decades [IDD]
In Demand Radio [IDM]
Island FM [ILD]
Isles FM [ILS]
Jazz FM [JAZ]
kmfm (Ashford) [KMA]
kmfm (Canterbury, Whitstable & Herne Bay) [KMC]
kmfm (Maidstone) [KMM]
kmfm (Medway) [KMR]
kmfm (Shepway & White Cliffs Country) [KMS]
kmfm (Thanet) [KMT]
kmfm (West Kent) [KMW]
Kool FM [KOL]
LMR, London Music Radio [LMS]
Love 80s (Manchester) [L8M]
Lyca Radio (Greater Manchester) [LYM]
Lyca Radio (Midlands) [LML]
m4dRADIO [M4D]
Made in Kent Radio [MIK]
Magic Christmas [MCM]
Magic Classical [MCL]
Magic Musicals [MMS]
Magic Radio (London & Bristol) [MLN]
Magic Radio (UK) [MGC]
Magic Soul [MGS]
Magna Mix [MGM]
Magna Radio [MAG]
Mansfield Radio [MAN]
Manx Radio (AM) [MXA]
Manx Radio (FM) [MXF]
Marcher Vibe [MCV]
Max [MAX]
Mellow Magic [MLM]
MFR [MFR]
Mi-Soul [MSL]
Mission Radio [MIS]
MIX 56 [M56]
Mixtape Radio [MXT]
MKFM [MKY]
Mom's Spaghetti [MSP]
Moorlands Radio (Staffordshire & Cheshire) [MOS]
More Radio (Eastbourne) [MRE]
More Radio (Hastings) [MRH]
More Radio (Mid Sussex) [MRM]
More Radio (Sussex) [MRD]
More Radio (Worthing) [MRW]
More Radio Retro (CEASED) [MRR]
Nation Easy Radio (Portsmouth) [NEP]
Nation Easy Radio (Southampton & Winchester) [NEH]
Nation Radio (South) (South Hampshire & Isle of Wight) [NHS]
Nation Radio (Westcountry) (Somerset) [NSS]
Nation Xmas [NCM]
Omega Radio [OMG]
Persian Mix Radio [PSM]
Premier Christian Radio (London) [PCL]
Premier Christian Radio (UK) [PCR]
Premier Gospel [PCG]
Premier Praise [PCP]
Pump Radio [PMP]
PURE FM [PUR]
Q Radio (Ballymena) [QBL]
Q Radio (Mid-Ulster) [QMU]
Q Radio (Newry & Mourne) [QNR]
Q Radio (Omagh & Enniskillen) [QOE]
QUAY-FM [QYA]
Radio Carmarthenshire [CRM]
Radio Exe (Plymouth) [EXP]
Radio Maria (UK) [MRA]
Radio Matryoshka [MAT]
Radio Pembrokeshire [PEM]
Radio Wigwam [WWM]
Radio X (Manchester) [XMC]
Radio X 90s (Manchester) [X9M]
Retro Music Radio [RMS]
Rotherham Radio (CEASED) [RTH]
Sami Swoi Radio [SMS]
Slim Radio [SLM]
Smooth 70s [S70]
Smooth 80s [S80]
Smooth Chill [SCL]
Smooth Christmas [SCM]
Smooth Country [SCN]
Smooth Jazz 24/7 [SJZ]
Smooth Radio (East Anglia) [SEA]
Smooth Radio (East Midlands) (East Midlands) [SEM]
Smooth Radio (East Midlands) (Northamptonshire & Peterborough) [SNP]
Smooth Radio (East Midlands) (Derbyshire) [SDB]
Smooth Radio (Essex) [SES]
Smooth Radio (Herts, Beds & Bucks) [S3C]
Smooth Radio (Kent) [SKT]
Smooth Radio (Lake District) [SLD]
Smooth Radio (London) [SLN]
Smooth Radio (North East) (Teesside) [STS]
Smooth Radio (North East) (Tyne & Wear) [STW]
Smooth Radio (North West) [SNW]
Smooth Radio (Scotland) [SSL]
Smooth Radio (South Coast) [SSC]
Smooth Radio (South West) [SSW]
Smooth Radio (Sussex) [SSX]
Smooth Radio (Thames Valley) [SBO]
Smooth Radio (UK) [SMT]
Smooth Radio (Wales) (North Wales) [SAG]
Smooth Radio (Wales) (South Wales) [SWS]
Smooth Radio (West Midlands) [SWM]
Smooth Radio (Westcountry) [SWC]
Smooth Relax [SRX]
Smooth Soul [SSO]
Somer Valley FM Rugby Commentary [SVR]
South Yorkshire Radio (formerly Doncaster Radio) [SYK]
Steel FM [STL]
Subjam [SJM]
Sunshine Radio (Monmouthshire) [SSM]
SWU.FM [SWU]
Tay FM [TAY]
TCMR [TCM]
The Amp [AMP]
The Buzz (Manchester) [BUZ]
The Music Machine 1 (CEASED) [MM1]
The Music Machine 2 (CEASED) [MM2]
The Voice Of Doom [VOD]
Times Radio [TMS]
URF, University Radio Falmer [URF]
Virgin Radio Christmas [VRX]
Voice of Islam [VIS]
Wyvern Timeless Classics [WTC]
xRhythms [XRT]
YorkMix Radio [YMX]
Your FM (Stockport) [YOS]

Irish RTÉ and commercial radio stations containing M in the name:
3FM (Ireland) [3IE]
8Radio.com [8RD]
96fm (Cork) [96F]
98FM (Dublin) [98F]
BOB FM [BOB]
Christmas FM [CMS]
Clare FM [CLR]
East Coast FM (Wicklow) [ECW]
FM104 [104]
Freedom FM [FDM]
Galway Bay FM [GWB]
Harmony [HMY]
KCLR 96FM (Carlow) [KCC]
KCLR 96FM (Kilkenny) [KCK]
Kfm [KFM]
LMFM [LMF]
Midlands 103 [MDL]
Midwest Radio [MWR]
Ocean FM (Donegal) [OCD]
Ocean FM (Sligo & North Leitrim) [OCS]
Onic Christmas (formerly Onic Irish) [OCM]
Radio Maria (Ireland) [MAR]
RedFM (Cork) [RED]
RTÉ 2FM [R2F]
RTÉ 2XM (CEASED) [R2X]
RTÉ Lyric fm [RLY]
Shannonside FM [SNS]
Tipp FM [TIP]
Today FM [TDY]
Today FM Country Hits [TCH]
WLRfm [WLR]