Quote Originally Posted by ciars
Gaskets John! A common flaw (or not for Velux given spare parts required!). The main one, which is between the frame and the sash and the often forgotten ventilation flap. Replace them and you should be back in business, once there is no other apparent damage/wear.

Congrats on the move! Stressful times
Thanks, I'll have a look into the gaskets.
The move was a bit of craic alright, no one got murdered in the process thankfully but it came close once or twice