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Thanks for the answer, I agree the sensible thing would be to put it off for another year. Whether my pal would be able to wait is another matter, but she has debts to pay off too so it would be in her best interests.
If I left home I think there are benefits my parents could claim to help with the rent, whereas if I'm just travelling, I still technically live there so it would be up to me. It sucks, but I can't complain really.
Sometimes I think I just worry too much! :)