I'm Andy from Edinburgh, and it's my first post on TMF! Bought myself a 2000 Rover mini cooper (and love it), next on my to-do list is some bodywork. Got some colour blending practice on my old corsa before I sold it, but it didn't need any filling.
Some rust at back of the a-panels (door hinges are concealed type), just wondering if that needs welded or if i can get away with filler. Slightly worse on driver's side than passenger, no evidence of rust near the hinges.

Rust under rear window (driver's side). Felt some damp on the rear seat the other day, So I'd like to do that one first (and check window seal). Again, is this okay with just filler to smooth it over?

Finger-size hole in bonnet, with bubbling around it - will filler take the heat?

Minimal work will be done until it's warmer, or I can get the car under cover - just after advice for now.