Thanks for your comments yesterday. After debating with myself I decided to try The Climbing Unit, carefully. When I said that I wasn't going to be staying long, they let me in for free with instructions to just move about gently. I stayed for 20 minutes, did half a dozen easy routes, using holds on other routes as necessary and quit while I was ahead. But I probably won't go tomorrow evening with the Club as we're climbing outside on Friday. Steady does it. 

Later: I picked broad beans, mangetout peas, purple kale and two beetroot, and uncovered the French beans because they'll be flowering soon and won't get pollinated under fleece.