Something to consider might be not eating a meal late in the day - and also for similar reasons, treating or resolving constipation.

I used to get cramps when at folk festivals, and after trying all sorts of preventions, I stopped eating my main meal in the evening. No more cramps.

These were inner thigh cramps and really agonising.

I mentioned this to someone else and he said he got cramps towards the end of festivals when the weather was hot, due to the pong from the toilets putting him off using them, but the problem vanished at the first clean facility on the way home.

Anne Croucher