Mike,
A delicate subject as I regularly take my bike onto trains. The best are South West Trains who have a space on their 455s that just fits two bikes with the front wheel fitting into a slot behind the seat. Bikes are correctly forbidden in the rush hour so the space is available for the SUV sized push chairs that some parents indulge in. The Electrostars have three transverse seats that can be tipped up for bike storage, fine until you have one prat occupying one of these seats, meaning all the bikes have to be held by their owners, blocking up space and annoying the other punters. The suburban Networkers have had no facilities for bikes so they are wedged into entrances but this may be just changing .....
Bill