It’s a long time since I used to use the Docklands Light Railway, travelling in to work on two toy trains from Westferry to Bank, scrunching as it turned the corners on the track.   I remember how at a dinner party in the mid-1980s a junior official at the Treasury told me that she had tried to cancel it as a public project on the grounds that there was no possibility of it being of discernible use.   Now it extends all the way south of the river, weaving its way through Canary Wharf and past the new huge station designed by Norman Foster for Crossrail.   I have been able to travel from Bank to Cutty Sark, past what used to be the wastelands of the Isle of Dogs and the Mudchute, and up Crooms Hill through the rain to the Manor House overlooking London.