I do think you'd be mad to have a car if you lived in London - or at least those areas served well by tube and buses. I lived in Barnes (south of the river, beyond Hammersmith) before I moved back to Scotland, and it's where I learned to drive, and eventually had a little car, which I took to/from work every day - but I only went up to Shepherd's Bush and quite often bussed it, as it was quicker!
I've only ever been on the Docklands Light Railway very recently, and for a very small part of a journey so can't comment on it. As for the Central Line - I didn't realise it was still out - that's a month now!
Jackie
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