Portsmouth has proved just too expensive this year. The caravan doesn't help, but you can't pay £5-600 just for a long weekend. I expect a week somewhere exotic for that price.
Websites were giving £150-200 for Dover, with Norfolk cheapest as usual, but then I tried the Caravanning and Camping Club travel, and they did P&O for £100. I know its embarressing to admit I'm a member, but at that price.....