Nationwide current account is paying 5% on balances up to £2500.
Santander 123 account is paying 3% on balances between £300 and £20000.
Savings accounts are all rubbish at the moment, including ISAs. You could gamble the interest and invest in Premium Bonds - at least your money is safe, it's only the interest you are gambling. Assuming you are a tax payer you'd be gambling around £200 a year, at most.
You could also look at peer to peer lending - a bit risky but could be worthwhile.
http://www.moneysavingexpert.com/savings/peer-to-peer-lending