Two basic rules govern the size of what you can take on the tube -
nothing over 2 metres (hence the old posters with that guy and his
inflatable crocodile) and nothing you cannot carry yourself. One of
the main flaws in this design, and indeed a major obstacle in improving
matters) is that LU has links to Heathrow, as well as other mainline
stations with airport connections, and thousands of people use the tube
to get to airports every day - with those annoying trolley bags!

The other week a fella turned up at work with a surfboard of all
things. He was flying from Heathrow and needed to take the board on
the plane... well, he should have checked before travelling, but still
it doesn't feel right, particularly late of an evening, to turn someone
down for carrying something that is about a mm over 2 metres.

Incidentally I didn't, but I warned him he'd probably not get far into
town with it...