Intelligent Finance, provider of one of the top ten direct mini cash individual savings accounts (ISAs), has announced a new guarantee to customers.

For the remainder of this year, the bank will pay at least the Bank of England base rate on all its mini cash ISAs held by new and existing customers.

The popularity of this guarantee led to introduction of a new one for 2006, says the bank's managing director, Nick Robinson.

He adds that banking customers that switch to Intelligent Finance can be secure in the knowledge that it is serious about giving them long-term value for money.

Mr Robinson points out that more than six in ten instant access mini cash ISA providers currently offer savings account holders an interest rate that is less than the base rate.

Intelligent Finance says it is the only bank which allows customers to offset their ISA against their mortgage .

It adds that almost half of those with ISAs will be better off financially after the first year of their new offset mortgage .