Okay, just a quick update on this 
The car now goes around corners much better and no longer scares me when I flick it around a roundabout in the wet. In fact, it actually corners and feels like my first mig (2.5 manual saloon) which is the one that got me hooked on the big engine / rear wheel drive thing  

Right, here is the crap bit  

The car still twitches initially to the left when I stab or brake hard.
I know that one of the rear discs is badly scored due the self-abuser who I bought it off telling porky pies about the locking wheel nut key being in the car and one of the rear pads getting down the rivets before I could get the wheel off so i'm thinking that this might have something to do with it  

I have also been reminded that this really started getting out of hand after I had the back end jacked up for the spring change / all the weight was on the front end for a couple of days 

My scanner isn't working at the moment so i'll post up the geo settings when I get it fixed.
Must say the lads at Hi Q saw me right.
Only charged my 42 quid for adjusting front and back over 3 visits  

Also another question if I may, the 2 bolts which need to loosened to adjust the castor should be elongated bolts iirc.  Are these fitted as standard or do I need to buy them separate when I change the front shocks ?