Piperpa38, Helen D is nearly right - the rules are that you have to complete 25 hours dual and 10 hours solo in one JAR member state. You also need to pass all the theory exams in this same state. If you have 20 hours gained say in France and then you move to the UK you are only allowed to carry over 10 hours to your UK training but these 10 hours cannot be solo.
If you want better weather why not go to an approved school in Florida ?