Double Glazing

[RedheadBaba]

We've got 2 double glazed windows which were put in around 11 years ago (I think - before we bought the house).

The windows themselves seem to be fine however we've noticed an increasing draft that seems to be come from around the edge of the windows, almost as if there is a slight gap at some point between the window and the wall.

Has anyone has this type of problem and were you able to solve yourself, get it filled/repaired or was it a case of replacing the window. Becoming a bit of an issue as our gas bill is ever rising and our bed is in the draft so get quite cold

TIA