Gatwick to Scotland in one go!... astounding
Your windows will go down because gravity is doing the job for you. The window regulator (if its the same as a spitfire) has a small plastic wheel that
runs in a channel at the bottom of the window glass. This can easily come out if you lower your windows too much and the 'stop' mechanism is misaligned
or worn. You can remove the stop mechaism (two small screws) and check the felt 'stopper' I turned mine around to get extra life out of it and it works
a treat now. It's a bit filldely to keep te window in it's runners and feed it back into the regulator channel though but it's a 10 minute job when you
know what you're doing.
The door sticking is undobtedly the lock / latch mechanism. There are three places you can adjust it. Firstly the 'wire' that acts upon the latch from
the latch handle inside the door, then theres the lock itself and finally the stricker plate. They need to be pretty well aligned to prevent them
sticking.
Shouldn't be too much hassle - just Sunday afternoon's fiddle, but a sticking door is an MOT fail if my memory serves me correctly... so you should
sort it out.