Ok so as I said in my intro I have just been given this omega, and I love it. The old owner (my F.I.L. to be) said that it was pretty much shot and not worth spending time on, but I like it and have decide to put in a little effort and fix the few problems so I can enjoy it for a while longer.

The problems I have are below and as I don't know the car well yet any help will be much appreciated.
1) Brake lights not working. I have checked the fuses and bulbs and they are all fine, so i'm guessing at the switch.
2)Cruise control seems not to be working. Having said this, I'm not sure what all the buttons do yet, so it could be me not using it right, or I also thought it could be linked to number 1)
3)Horn not working. easiest to attach a new horn I think.
4)Air con not working, I have been told the pump is seized, is this an easy thing to replace?
5)The rear blind thingy doesn't come up when the button is pressed, I was told it used to but stopped recently.
6)Small areas of rust on the door bottoms. My plan is to simply replace the doors on this one.
Any advice welcome.
Cheers
Chris