(Counter Clockwise - Starting with Southwestern Seaside Counties going West to East from Atlantic to English Channel to North Sea then finally around to Counties on the Irish Sea)
See Atlantic/Bristol Channel & English Channel Counties
(Cornwall, Devon, Somerset, Gloucestershire)
See North Sea & Irish Sea Counties
(Kent, Essex, Suffolk, Norfolk, Lincolnshire, Yorkshire, Durham, Tyne & Wear, Northumberland, Cumbria, Lancashire, Merseyside)
See Bermuda Surfski
See Scotland Surfski
See Wales Surfski
There are also links on the seaside pages above to local paddling clubs. And of course there are many inland paddling clubs that you should be able to find via the following links: (example - Elmbridge Canoe Club - (Surrey) Flatwater racing and SUP, you can learn technique here and there are undoubtedly folks who also own surfskis to talk to.)
Henry Cavill and Simon Pegg on English Slang