Below and in the categorized sub-menus you'll find various paddle boarding resources in or for the UK, we can't vouch for or make any guarantees about the details, accuracy or information provided, companies or products listed or accuracy of anything stated etc...
Weather, conditions & environment
https://www.windytv.com/ - Wind map and weather forecast for kiters, surfers, pilots, sailors and anyone else. Worldwide animated weather map, with easy to use overlays and precise spot forecast. METAR, TAF and NOTAMs for any airport in the World. SYNPOP codes from weather stations.
https://www.facebook.com/UKSUPClubs/ - US! Woohoo!
Stand Up Paddle Mag UK - or SUPM for short.
http://kanuculture.com/stand-up-paddle-boarding-book/ - by Steve West.