On the LUL I have (unfortunately) had to travel from Cockfosters when the ECML went up **** creak and I had to use the Picc as an alternative. It was LONG!!!!!
So effectively travelled all of the Picc (except that disused bit to Aldwych)
On the Northern line I have never been all the way South, though I THINK I have been up the top of both Northern branches, never been to MHE tho.
Central been as far west as can be, but hmm I think Loughton or something. Certainly never been to Epping (or Ongar).
All of District, Jubilee, C&H. Met main, never been Chesham, done the rest. Vic line, never been south of Victoria, done the rest.
B.Loo, never been south of W.Loo or North of Willesden.
All of W&C
Did a lil bit of ELL when it was under LUL, maybe Surrey something to Whitechapel
Anyway I have no desire to do any of the rest that I don't have to. Travelling on the LUL is a nightmare