I'm definitely getting fitter. As I cycled the first half of the trip from Windsor, I noticed I was on the whole travelling faster than normal. And it felt easy to keep at that speed too. By the time I'd got the station at MH I'd managed to average just over 10mph which is a personal best.
At a rough calculation, I'd only need to average about 11mph to be able to do the entire journey from MH to home in 1.5hours. Unfortunately the average dropped once past the station as that is where it gets quite hilly.
When I got in I found that someone had pinched the shower head for the shower. It mysteriously reappeared when I pointed it out to the guy in charge of the building, so eventually I managed to have a shower.