The United Kingdom is split into 18 RDA Regions.

• RDA South West Region
  • 0845 241 6301
  • Covering Cornwall, Devon, Dorset, Somerset
• RDA Mid West Region
  • 0845 241 6302
  • Covering Gloucestershire, North Somerset & Bristol, Wiltshire
• RDA South Region
  • 0845 241 6303
  • Covering Berkshire, Buckinghamshire, Hampshire, Oxfordshire
• RDA South East Region
  • 0845 241 6304
  • Covering Kent, Surrey, East Sussex, West Sussex
• RDA Greater London Region
  • 0845 241 6305
  • Covering North, Central, South East & South West London
• RDA West Merica Region
  • 0845 241 6306
  • Covering Herefordshire, Shropshire, Staffordshire, Warwickshire, West Midlands, Worcestershire
• RDA North Midlands Region
  • 0845 241 6307
  • Covering Derbyshire, Leicesteshire, Lincolnshire, Northamptonshire, Nottinghamshire
• RDA East Region
  • 0845 241 6308
  • Covering Bedfordshire, Cambridgeshire, Essex, Hertfordshire, Norfolk, Suffolk
• RDA North West Region
  • 0845 241 6309
  • Covering Cheshire, Greater Manchester, Lancashire, Merseyside
• RDA North East & South Yorkshire Region
  • 0845 241 6310
  • Covering East Yorkshire & Ryedale, South Yorkshire
• RDA Yorkshire & Cleveland Region
  • 0845 241 6311
  • Covering Cleveland, North Yorkshire, West Yorkshire
• RDA North Region
  • 0845 241 6312
  • Covering Cumbria, Durham, Tyne & Wear, Northumberland
• RDA Edinburgh & Borders Region
  • 0845 241 6313
  • Covering Borders, Dumfries & Galloway, Edinburgh & Lothian, Fife
• RDA West & Central Scotland Region
  • 0845 241 6314
  • Covering Argyll, Ayr, Central Scotland, Perth, West Central Scotland
• RDA Grampian & Highland Region
  • 0845 241 6315
  • Covering Grampian, Highlands & Tayside
• RDA South Wales Region
  • 0845 241 6316
  • Covering Dyfed, Glamorgan, Gwent
• RDA North Wales Region
  • 0845 241 6317
  • Covering North Eastern & North Western Counties
• RDA Northern Ireland Region
  • 0845 241 6318
  • Covering Belfast & Co Down and North & West Northern Ireland