I did my training with GAFIRS at lee-on-Solent. They are an indipendant Inshore lifeboat/rescue service. The tuition is supplied on a voluntary basis and the moneys they collect go towards the running of the Service.
I'm sure that this format can be found all round the country and you'll be getting a DSC VHF licence at a competitive price and rest assured that you are helping a voluntary Rescue Service at the same time.
Find what area of the Coast you want too get trained in and do a search.
In the mean time have a look at their website HERE