Many thanks to all responders.
I think I've seen enough to put me off the idea. My estimate of £500 may have been a little low.
However, having fallen foul in a way with Part P, the talk of tighter regulation on rental property (under East Riding Council) makes my blood run cold.
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How's the holiday rental market there?
Total yields are much better, and tenants tend to be "better behaved", so there isn't really much extra effort in running it (you can employ a local cleaner for the weekly handover), though obviously there's extra effort/cost in marketing plus the initial furnishing.
The treatment for CGT on exit is better as well
you can buy 6 of these:
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wouldn't holiday in it, but people do)
or perhaps 2 of these:
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not all park home managers will let you rent them out, but some will
tim