People hoping to be frugal with their spending could actually be losing out on hundreds of pounds a year. Research from Nottingham Building Society discovered that some seven million people in the UK keep a stash of cash at home, which could result in missing out on a lot of potential growth if you put the amount in a savings account. You may think it's the older generation who tend to do this, but the figures suggest it's younger savers who have like to have a well-filled piggy bank at home.