I use trains a lot at the weekends. I cycle out on a route, and instead of returning by bike, just head for the nearest station (usually within 5 miles). This extends my cycling range quite a bit, and weekend tickets are pretty cheap.
I go back to my parents house by train, cycling to the station, by rail to London, across London by bike, then by rail again to Norwich, then by bike to their place. Its a great combination.

If Im feeling bad and its really cold and wet, I take a bus into work, but the walk to the bus stop and a 10 min wait in the cold mean its usually better to walk in the whole way.

I dont own a car, but rent one as I need to (about 3 or 4 times a year)

Rich, you ought to look at getting a Brompton folder, for each end of your train journey.