On the bike machine did 20km in 30.32mins, on the treadmill did 4km in 35mins (1km walking) and in the pool did 750metres in 20mins today.
I am thinking (very much in the theoretical stage) that I should try some form of triathlon to make me a bit more competitive. My big worry is the running as the other two at the moment are going quite nicely I reckon.

Erica, as for short course and long course I presume you mean 25 metres and 50 metres pools. I too find it more taxing on my back to swim in the 25 metre pool but since for various reasons I end up in the 25 and not the 50 metre pool sometimes, my remedy is to turn that little bit slower and steadier and kick off with less force because lets face it I am doing exactly double the amount of turns.