Application fees on the best buy fixed-rate mortgage deals have nearly doubled in the past year, according to current analysis. In the last year alone, the fees on the five most competitive two-year fixed deals have moved from an average of 999 up to 1,478. And for three-year deals the average level of fees has moved from just 578 to 1,132 now. Last October the base rate was 5.75% and the average interest rate of the top five two-year fixed rate mortgages