If you’re in the Bournemouth area, beware of using the toilets at the Avon Heath truck park off the A31 - it flushes without warning while you’re sitting on it. The loo in question is the leftmost “gents” cubicle with the bag propping it open in this picture.
WhiteTruckMan:
Here’s a tip. Don’t sit on the throne wearing hi viz. It quite often trips the contactless flush mechanism.
I only wear a hi-viz when I’m in a yard that requires it. Then, I was on my break in a truck and caravan park which also features an adventure playground (which I didn’t get time to visit this time).