Hi AndrewP. Yes, I bike-train-bike. But it's only about three miles to station and then three miles at the other end (so about 12 miles a day). In a way, I wish it was further, as it's such a nice, relaxing way to get to work.
I gave up using the tube to do this last October. 7/7 was obviously on my mind, but also the fact that, after the initial outlay (my L3 was second-hand from eBay), I would save a fortune. Plus I'd lose some of the gut into the bargain! Everyone's a winner.
Only trouble is, in mid-June I had a brush with a pedestrian in central London, came off and broke my elbow quite badly. It needed a pin inserting. Just returned to Brompton last week, albeit with a right arm I can't quite straighten yet, plus an all-essential pair of elbow guards! Perhaps you shouldn't mention that if trying to persuade someone to follow in my footsteps.