Why has the top plate dropped down at the front and ridden up at back and the insulating wool is visible?
The top plate may have dropped due to the front layers of insulating gasket moving out of position. This could be for a number of reasons but most often is due to a disturbance during sweeping.
If the layers of white gasket material are still intact they can be relocated back into position. If not then new sealing strips can be ordered to replace these from our online shop.