I have been swimming!
You have to book, and sessions are only 45 minutes, which is fine for now, as I haven't done tons of exercise during lo known, but it will become less fine as my fitness returns. I can still do 1000m in half an hour, but it was a bit harder than it used to be. :-)
Only the 25m pool is open, not the teaching pool nor the leisure pool (with slides and stuff.) They have 3 double lanes - slow, medium and fast. Usually only the slow lane is double and the rest are single, but this allows people to swim in a more socially distanced way, and there's room to overtake. Although there are still people with no sense of lane discipline.
There's 15mins between sessions, which allows one group to clear out before the next comes in. Only a handful of changing cubicles are in use and they tell you to come with swimmers under your clothes and to be prepared to go home with just a towel dry and clothes over wet swimmmers if there aren't any cubicles, but I had a choice of several. They are much improved after deep cleaning, too! They said no showers but there are actually two available, but I just showered when got home anyway.
There are one way systems marked on the floor to go in and out. Parking was really easy, though I don't suppose that will last.
All-in-all, it was a good experience, and it will keep me going for now. I hope aquafit classes will come back at some point. I hope they will have some later sessions at some point, too. If I go back to the office before they go back to usual times, I wouldn't be able to do sessions before or after work, because the timing wouldn't work. I can only get there for the 18:15 session now because I am not commuting currently, and in the morning, the first session is currently 8am rather than pre-pandemic 6am.