I would look around at other loans though- you can bet your life Barclays is not the cheapest way to borrow money as they have loads of premises and staff to keep! Search for "cheap loans" on google, or look on uswitch. If you borrow more than �15,000 you usually qualify for the lowest rate of interest, so you end up paying not THAT much back as extra. Do be careful though, cos your loan may go up according to the bank of england interest rates, and if it is a "secured" loan, this means they will take your house if you default payment.
If I were you I would get an independent financial advisor to find you the bnest deal for you.
Try these:
http://www.thinkpositive.com/home/client/main2 .html
This great chap came to my house to advise me on remortgaging. It didn't cost anything as he gets his money from the company I end up going with, and he really knew his stuff.