So it is true the simplistic charges £1 and £5.
If you are in the delicate situation of being overdrawn on your current account and this is a reasonable amount try to open a credit card account that offers you the longest 'zero' rate on balance transfers, I believe some are extended to 15 months. During that time budget your finances to clear the balance (as much as possible).
This would be a short term fix for some people but not everyone.
I hope it helps