I thought I would post an update after I followed the advice to contact Tony, at Wheels in Motion.
First of all he gave me LOADS of advice on settings and then assumed I was going to get the car set up somewhere else! Very impressive.
Having ruined several tyres I was cetainly going to get him to do the work.
Went to where he is now, near Hemel Hempstead (although he is moving soon) in June and he spent an hour sorting out my car which he reckoned, despite my report from a year ago, was ALL WRONG . I had just bought two new front tyres and depressingly he pointed out the rns tyre had nearly gone on the near edge as it was so out of alignment.
So back from Wheels in motion and I had to buy two new rear tyres as well
Then got the car BPU'd at Whifbitz (brilliant) and have since driven over 4,100 miles......... ( @ 2,000 of which would have certainly " exercised" the tyres)
So, the result......... (just had the free check/fine tune)
Front tyres (8.5 mm's of tread when new) now have 7.3 mm's
Rear tyres (8.5 mm's of tread when new) now have around 6 mm's of tread
All totally even wear.
Thus if you are having problems with wheel alignment, Tony is THE guy to go to.
It seems to be more of an art than technical with him and the results speak for themselves.
Marks out of 10.... 11