It's a Hygena APP2180 cooker extractor hood. I've only ust moved in and realised the hood lights didn't come on. Took out the old one and bought the same bulb. When I put a bulb (it needs 2) it just blew and didn't work
Sounds like you are mega unlucky with the replacement bulb, or you are experiencing a dead short. Likely grease or a burn/melting of the lighting cables.
Check with another Bulb first.
Get it PAT tested by a qualified electrician. And prepare to replace if necessary...
Mark - Fuse Electrical Services
Make sure the bulb contacts are clean as they can get greasy in a cooker hood. Use a screwdriver to lightly scratch them ENSURE IT IS ISOLATED FIRST! I expect however it was simply a bad replacement bulb.