Camper stuff.
Something started to emit a "Beep" warning type sound, nothing dramatic, just a single note about one second long repeated every 30 seconds or so.
I checked under the bonnet but it didn't seem to be coming from there, so I tried inside the cab up under the dash, ot didn't seem to be coming from there either.
The closest I could get was in the bit where I installed the leasure battery. In there is a split-charge relay that I installed myself, if anything had gone pear-shaped it was liable to be that.
I stripped everything down and tested it.
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Eventually, I located the problem.....