If you have £75k in the bank at the moment you will do well to get much more than 1% pa. Interest for a year is therefore £750 at best. Of course you can reduce the sum held as soon as it exceeds £75k but I would not worry too much. More important is to beware that many institutions share their licence (and hence their compensation limits) across their brands. For example, RBS and Natwest are sister banks owned by the same institution. If you had £50k in each you would only be covered for £75k if they went belly-up.