If it was me, I would not mention the move until renewal in April 17, its only 6 short month. Then get a fresh new quote that you said it was 100 quid more. This is only my opinion and not suggesting you do that lol. They are robbing baskets more often than not with huge mark ups, BUT you are just 22 and thats High Risk to them. Joys of owning a 3500Ltr V6.
Another way is to get a 100 quid clio. Do a change of vehicle and address on that till April.