Just on the item about being unable to get up the ladder yesterday, when I arose this morning, I felt more energy as I usually do, so I had another go before my shower. No problem. After a night’s sleep, I had enough muscle strength to get up the ladder.  Battery replaced, sensor tested and working. Hmmm. Just shows how important sleep is.

I should add that “before my shower” is true. The power was off when I awoke at 7:20am, so no radio and no CPAP machine, so no breathing, and no shower either, because the gas hot water heater needs AC mains to run. No hot water.

The power’s back on now at 09:45am, so I can have a shower.