Hello Christopher The Bristol Channel sailing scene has changed dramatically over the last 10 or 15 years. Prior to that marinas were few and far between so Bilge keelers that could dry out easilly were fairly predominant amongst cruising people.
Now there are Marinas at Sharpness Portishead Bristol Cardiff /penarth Swansea Milford Haven and plans afoot for a few other places more and more people are opting for the better performance offered by fin keelers.If your keel is not too extreme you have the option of leaning against a harbour wall in places like Minehead and Ilfracombe.
The Tidal heights may be extreme but similat tidal streams are encountered in the Solent and other popular cruising places.
you do need to plan yopur days sailing with the tide in mind. Basically a day sail from Penarth could mean locking out near low water for a cruise up towards Portishead /Bristol or locking out near highwater for a sail down to the west and back.If on a cruise the tide can help you cover big distances in a days sail.
There arent many places you can get into below half tide so you may need to anchor off somewhere like Ilfracombe or Minehead waiting for the tide to allow you in.Swansea Caerdiff and Milford Haven Estuary can be entered anytime.Watermouth and barry can be entered at low water then move further in as the tide allows.
Wind over tide can kick up the sea a bit around headlands but thats common everywhere.
Especially if you sail midweek you may often not be able to see another boat. At busy times such as first lock into somewhere on a bank holiday you may think your back in the Solent.
I love sailing in the Bristol Channel because I can overnight somewhere in peace and solitude or use a marina with all facilities depending on my mood.
If you want any specific information about joining a yacht club or anything please feel free to send a Private Message