I am the same as you, I have my prom coming up on June 24th, and I have 3 cars I'm looking to hire. We live in the south west of the UK and the guy up the road from me who is good friends with my mum owns 2 like these:
http://upload.wikimedia.org/wikipedia/commons/7/7f/Bentley_Continental_GT_(II)_%E2%80%93_Frontansicht_(1),_30._August_2011,_D%C3%BCsseldorf.jpg
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and I'm looking to hire this from a company if I can, the company around here do it but I need to look how much it will cost, if not my mums friend will take me in either one of his 2 of the ones I posted above and it will only cost £20.
https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcTW4oI1c1vJ-TxJqlCbplH6eiPeEJGF0KBenAU54Hy5f3CXA96cvg
((Ignore this. Mace is a noob))