<edit, reply to Speicher>
None!
We work Bank Holidays anyway, but Monday is my day off, so I'll work Friday, and be off Monday as usual.
There's a big Model Railway show on at the race course building, and the big car boot sale at the race course has restarted for the summer, so that's one day taken care of, and the Model Show will be indoors.
If it's not nice, then the rest of the time, we'll decamp to our favourite coffee shop, and watch the world go by, and covet their umbrelllas. Just chilling out, and no plumbing!