Thanks everyone for the replies - was very interesting to read the suspension write-up thread.
Have been quoted £170 to fit including alignment etc but must admit I am quite worried about the job becoming a nightmare and getting a massive bill.
I tried to get another look under there but can't see a part number on the shocks, however the tops don't seem any wider and they are certainly not oval so I think I can safely say my suspension is the standard type.
Need to get the Christmas melee out the way and then will be looking to sort some springs.
In the meantime, car is in the garage today getting a couple of little things done :
Rear window regulator - this was duff when I bought it and is being fixed as part of the deal.
Thermostat - Looks to be the standard stuck open problem, car runs at 50-60 degrees and in this cold weather never really warms up. This is also being done under the warranty so all good.
It's also had the cambelt and tensioners done and a clutch fairly recently so that's a few of the common problems out the way for a while
Am also toying with the idea of changing the Airflow Meter and Pollen Filter as these are cheap and easy things which may give the engine and fan a bit more poke.