I'm in the process of having my mortgage a/c checked by my lender. I believe that I'm being charged 0.25% too much and no it's not one of Trichets increases. When I say in the process of I mean I have brought it to the lenders attention and they're telling me there's a backlog of one month with the lenders mortgage a/cs in the Dublin office. I was told this by my local bank branch. I feel I am being fobbed off but am willing to wait the month to see what happens. My question is this: if I am correct then I will have had the overcharge for about 16 months (never noticed it until I was going through some bank documents!) - is there a formula whereby I could estimate what the overcharge may be in money terms?