I currently have 11 accounts according to check my file, all up,to date although one was apparently late 3 times (account now closed, balance zero - electricity account after suppliers changed, over a year ago), some accounts have small amounts, between 500 and 800, have approx 10k in unsecured debt in total (affordable) plus a mortgage on a property we rent out, yet it seems I only have a fair credit rating with experian and a poor credit rating with equifax. Any suggestions for improving this in order to look at getting another mortgage this year?