Have you tried body boarding? Perhaps you can do this first just to get yourself (even your parents) acquainted with the idea (some people change their mind about surfing when they find out how cold the water could be). That's what I did before I commit myself into taking lesson and buying all the surfing gear.
You can get yourself a Body board because it's cheaper than surfboard in general, plus it's easier to carry and store (but don't buy those really cheap one as they snap easily). Also, this way you may not have to trouble your parents when travelling with it (like putting the surfboard on top of their car roof). And when you think you really like being in the water no matter how cold it is, then go ahead and proceed to plan your first surf lesson and/or camp.
As for wetsuit, there are plenty out there that cost less than £90. Especially for juniors. Try this shop
, they are very good in price, shipping and exchange if the suit you've ordered turn out to be too small. Also check ebay regularly, second hand suit and/or board could be good (make sure you clean the suit with wetsuit shampoo before using it). You could even be lucky and get wetsuit, boots, fin and boadyboard all for around £100 on ebay.
The important thing is you are committed and not just in it for the looks. Being far away from good surf should not stop anyone from surfing or even start learning. I met couple of girls from Sweden in Lanzarote. Despite living in the land where there is very little surf, they are as eager and committed to learn to surf as anyone who lives near plenty of surf. When there's a will there's always a way.