Plumbed in the 2nd waterbutt. It collects an overflow from the first which works. I used various containers, and a dustbin to hold the water while I worked on the tank (the whole point is to svoid wasting water) then put it all back in.
This all means that I feel rather clever right now.
There is rather a nice phot on my phone of our toad, I don’t have a ready way to getting it off yet.

Got energy back today.that fizz returns, the one that makes me get up and do stuff. the first week of Summer holidays is like this form most teachers, it seems.