after the discussion when my old corsa was totalled, Im looking at a
replacement. As far as haggling is concerned whats the usual markup these
guys start at.?

Ive also seen the old car - it looks like the impact was in the rear part of
the passengers door. The whole passengers doors side has been pushed in
about a foot. The gap that existed between the drivers and passengers seat
doesnt exist any more and the floor in the rear passenger space is buckled.
Still no useful pointers to guessing impact speed from the other guy ?
As soon as adolescent teenager gets up & sorts his camera out I can upload
some pictures smewhere.