Well here's the problem in terms of getting to the cause........
He took the red cover thing off and did something in there but i'm not sure i want to mess with that......or even what to look for! There is a big screw on top of it so i presume its that bit i need to undo? The boiler is all the way to the floor you cannot get a finger under it so if there's oil under it i'm screwed........starting to wish i'd settled for being cold now!