... we were actually swimming for exercise in the deep end when I asked her if she could get her children to be a bit more careful as we both wear lenses (incidentally my daughter is only twelve and is still getting used to them). Her children had chosen a 'spot' right on top of us to have their fun and I suggested to the mum that there was lots more space in the pool. Her response was lukewarm. When it made little difference my daughter and I left the pool to sit out on the loungers. It was when water started to fly over and land in my bag and all over my book that I told her that was enough. You know the rest.

Thank you for all the understanding comments.