So this weekend I've been sorting the ol' worms out.
After taking the metal back further I ended up with this

and the back of the sill was shagged so I decided to cut part of the sill back

and welded in a new section I made up (partly tacked on in the picture)

I made up and tacked in the new section in the wheel arch

and have finished welding it in, treated it and am letting the treatment dry so I can paint it and waxoyl it tomorrow.
When taking the sill trim off I also found this (just below the back of the driver's door)

so I'm going to cut that out and weld a new section in.
Stripped some paint back on the wheel arch and chucked some Kurust on it.

Should have the welding finished tomorrow night so next I'll get the VCDS on it so I can sort the ABS out. Will buy new sensors if needs be. I'm hoping my shocks will turn up tomorrow or Tuesday so I can get onto them and get the retest booked in.