Well if you have a few hours to waste you could always do Northern to
Euston (Bank Branch), Victoria to Finsbury Park, Piccadilly to Manor
House, Piccadilly to Barons Court, District to Gunnersbury, District to
Monument, Circle to Farringdon, Thameslink to Gatwick. It may not be the
quickest route but it is all cross-platform interchanges!


LOL

You forgot the half-a-dozen steps at Farringdon! g

--
Peter