As I was wandering back through the building having been across to the C block shower, someone asked me if I knew that they had installed a couple of showers downstairs, pretty much directly under where we were standing. No I didn't.
I dumped my stuff at my desk, chucked my soup into microwave to heat up then went off to find the showers. There are indeed two spangly new showers with big changing cubicles in a large room downstairs. How fantastic is that, I can now park my bike inside this building and have a shower without having to go outside again.