Just noticed that Nationwide have a new lower interest rate Loan, they've dropped their interest rate to a very low 6.3% find out more here:

Nationwide - Unsecured Personal Loans & Online Personal Loan Quotes

With our great rate, an unsecured personal loan could be more affordable than you think

  • Low rate: 6.3% APR representative for loans of 7,500 to 14,999 for up to 5 years for our main FlexAccount customers
  • Commitment-free quote: We'll give you a no obligation quote - that won't affect your credit rating
  • Instant online decision: Our online application process takes just minutes to complete and most applications will receive an instant decision
  • No fees: We won't charge you any fees for setting up your loan
  • Fixed monthly payments: Your rate is fixed for the term of your loan - your repayments will never change

this is as far as I've found the lowest interest rate for a personal loan currently on the market.