Andrew Dyke brought next idea :
>
> We had the same toilet problem in the summer, just before we set off on our
> holiday cruise oop north. We now make sure the water fills to the correct
> level before leaving the bathroom and always switch off the pump when
> leaving LT.
>
I have the answer to this, it involves fitting a timed shower valve
available from Screwfix (No.65124) in the toilet inline with the WC. To
operate press the timed valve and then flush as normal, after 25
seconds if the WC flush valve fails to seal then this one turns off the
water.
They had them fitted to the toilets on the barge we holidayed on last
year in France.
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