Thanks as ever for all the encouragement, it helps a lot.
Another 6 months has gone by so I'm overdue an update!
I left you with a pic of a sorry looking sill end.
Time to bite the bullet and cut it out
The back end of the inner sill was sort of still there!
A new corner piece was needed to link arch, floorpan, and inner wing. Out with the hammer
And it came out OK
A couple of local patches to the inner sill and an end closing plate
But what to do with this mess?
I used one of Mark's pattern sills for repair sections and them beat the whatsit out of it to get the right profile (2mm thick - heavy going)
This bit had to be made from scratch
Oops
Back on with the repaired sill
Looks good.
A new flange for the bottom of the B pillar
And in that went too
Again - happy with the result
That's the nearside sill & floor and A & B pillars done and hopefully good for another 40 years. Onto the offside rear.