Do a search on HSBC.
To give you an idea, you can get an unsecured loan of £15K-£25K max. Anything more will usually require security - i.e. your house, or parents' house. If you or your parents have a mortgage, then the surplus equity in the property can be used as security.
You'll need to write a good business plan before you see the bank manager and have solid answers to all potential questions.
Oxford advertise that their local HSBC will lend you upto 90% of the course costs, so you'll need a lump sum to cover the remainng 10%.
If you mangage to get through the CTC selection, HSBC will give you £60K-£65K unsecured just by filling in the form, as you have a very high chance of employment.
Cheers,
K2
