Originally Posted by PeteSmith
Also any advice on the required paperwork & customs proceedures?
Have a look here
and don't worry too much about customs! You're supposed to "clear" but it's all very informal for small vessels. UK-France-UK is in the EU, so free passage of people and goods and all that. If you leave the EU (ie Channel Islands) then it's legally different, but in practise all very relaxed.
Alderney is a highly recommended destination (bit further for you than us) - take you driving licence as you may find it useful to hire a Mini-Moke to explore.
Mike C recently posted some details of a cruise he did from Dover to Le Touquet which may be of interest to you. See here: http://rib.net/forum/showthread.php?t=14778