Hi, I'm Robert and I'm also 15 and I live in England. I have been playing for a year and a half.
I consider you to be quite lucky. You have an RG470 whilst I only have a 270. I am also quite poor, like you because I don't get any alowance money from my parents. Instead I have to get up early in the morning, before school, and go to work to earn money so I can buy my gear. I also have an after school job on Thursdays. I earn approx. £27 a week. Here's a list of my equiptment:
Ibanez RG270-£300
Yamaha Nylon String-£380
Zoom 707-£110
Marshall AVT100-£440
Crybaby Wah-£80
Boss BR1180-CD-£800
(And I bet you all of this gear is cheaper in America and Hong Kong)
All this is bought with my own money. It has taken me ages to save up for it and I don't complain because I want it that badly. I don't have a cell phone because I can't afford it and I don't take the taxi I have to take the bus to get to places.
My Dad is 110% behind me but just can't spare any money to give me. All it takes is a bit of hard work to get what you want rather than expect to get it handed to you on a plate.
I'd say you have a good guitar and plenty of good resources to practice with. I may have a similar guitar to you but I put up with it and spend my time practicing. About 2 months ago, I was selected as one of 5 'Young Guitarist of the Year' finalists. So that proves that just hard work and putting up with what you are lucky enough to have can get you far.
You do definately need a better amp, so get a job and stop whinging.