tubechallenge.com

All Lines, but they have to be done in order (Bakerloo, Central, Circle...)

(I'm not volunteering BTW!)

hopeful traveller wrote:(I'm not volunteering BTW!)

I think that should tell you something. If it was an interesting challenge, you would want to do it!

Generally, challenges where things have to be done in a set order are less fun than challenges where many different combinations/permutations are possible.

Just a personal opinion.

When I saw the title I thought this would be a wales/west challenge

Bristol Temple Meads East Junction.

Maybe. There don't seem to be enough lines ...

No idea. Derby?

It's Bristol.