It is the question that annoyed Marco Pierre White so much he banned it from his restaurants – a hovering waiter asking, "are enjoying your meal, sir?"

And, after what happened at south Wales curry house, it is easy to see why.

When David Evans, from south Wales, and his wife Michelle gave an honest opinion to that polite enquiry they had no idea what was to come next.

"Tough and rubbery," they said.

The next thing Mr Evans knew was a raging head chef had stormed out of his kitchen and thrown chilli powder in his eyes, leaving the 46-year-old pipe-fitter sick in pain.

Mr Evans had to be rushed to hospital and have drips flush wash through his eyes.