First time I've ever seen a Brompton fold up bike on the Tube and was really pleased to see how small it becomes. Loads smaller than most people's luggage that I have to contend with on Heathrow trains on the Piccadilly Line.
Not sure how easily they unfold though as he didn't get off at my stop. Looks very snazzy though and I pictured him, just shaking it and it bouncing into shape, ready for action.
Fold up bikes are the only bikes allowed on the whole London Underground network. With other bikes you can only travel with them on certain lines (although never on the DLR and Waterloo & City Line & Victoria Line) and at certain times (normally outside peak hours). I found this puzzling though - "Bicycles may also be taken during rush hour in the opposite direction to the majority of travellers" In the rush hour, it's hard to work out what the opposite direction of the majority of travellers is.