Where do I Start

Thanks guys.
I think ill get the uni's underway first and go from there.

Along the lines of what others have said, I'd do the following:

Radiator & hoses
Engine service
Transmission service
Tail shaft uni (depending upon the severity of the vibration you may consider moving this up the list)
Bushes
Leaks

Then I'd check the oil quality in your diff and if you think it needs replacing replace it. Most of it you should be able to do yourself if you want to. The extras that you are planning are good but it is best to make the car more reliable in the first instance.