Thanks to the super helpful reply I got to my first thread here about my heater problems, I've got a load more. Many thanks to anyone who can offer any advice, and I hope it's not taking the p*ss to post so many queries at the same time

Anyway, my car is a G reg Mk1 GTi Cabrio, totally standard except for Konis all round. No power steering, but does have the hydraulic hood.
1- Anyone know what makes the glass in the doors rattle, or what needs replacing to stop it? The driver side window glass is much looser than the passenger side - if you close the door with the window half wound down, or drive on bumpy ground, you can hear the glass knocking around a bit.
2- It's got a very noisy fuel pump - I know there are other threads saying this is normal, but when you start my car you hear clicking from the pump, which speeds up then stops, but soon develops into a pretty loud noise, somewhere between a whirr and a whine

Haven't driven it enough to be sure, but I think it's worse the emptier the tank is. If it's dying, and needs replacing, is it likely to be the main pump, or is there an in-tank pump in my car too? If so, should they both be replaced at once? And finally, are the new pumps they sell at German and Swedish proper quality ones, not 3rd party nonsense?
3- How easy is it to fit a new back window assembly into the hood? Mine has some rust around the edging, which I don't like the look of.
4- Any tips on how to quieten a rattly clutch pedal? Or is it just natural play caused by wear and tear over time? I'm on a quest to make this Golf nice and quiet inside the car, and hearing a clink of metal whenever you put your foot to the clutch pedal sounds kind of cheap...

5- Assuming I can find one (anyone selling one here?) a new interior carpet, is it a nightmare job to fit? and will a carpet from any era Mk1 Cabrio fit my car? The previous owner cut away some of it for his very poor ICE install, which now makes it nearly impossible to get the plastic rails and clips along the bottom edge of the door area to get a grip on the carpet and hold it in place.
6- Very mild pinking under hard acceleration - what's the most likely cause of this? Timing, plugs or is it more likely to need de-coking of some sort?
Phew...! That just about covers it!
Cheers ahead to anyone who can help out

Will.