Savers in Harrow have the highest average ISA balance in the UK, according to data from Nationwide Building Society.

Harrow is one of only two areas in the UK where savers have an average ISA balance of more than £15,000, which is the current annual ISA allowance, with an average of £15,476 saved.

The borough is also one of ten areas in greater London and south east that are among the country’s top 20 areas according to people's average ISA balance.