Having laid on a coat of sealer, followed by two coats of paint, followed by another coat of sealer, thicker this time, and another two coats of paint, and then yet another coat of paint, which has left a slightly less violently yellow stain than before, I came across this gem, online:

“Fill a spray bottle with diluted peroxide (2 to 1 with water). Spray the stained area. Allow the area to dry. You may have to do this twice to remove the stain entirely.”

So, curing all known lurgies isn’t the only thing that magical liquid can do.

I met your neighbours as I was leaving this morning. They asked if I was your new tenant. I explained who I was, and Anne nodded, looking pained, saying she thought she remembered me. Probably, she had had a fleeting mental glimpse of me hammering the final nails into the treehouse this time last year!