My son and I were on holiday in Ireland when we had lunch at John Dorys. They had oysters on special and we shared 6 between us. That night my son developed stomach crams that got so severe I had to take him to hospital. He couldn't walk, the pain was so bad. The doctor on duty diagnosed food poisoning due to a bad oyster, and my son was booked into the hospital for 4 days. Later a nurse told me that the doctor had been worried my son wouldn't make it.
I visited the take-away after a few days to report what happened, as I felt it important that they be warned about the spoiled oyster. The manager on duty was unavailable to see me, but the waitress who helped me couldn't have been more indifferent. She hinted that it couldn't be proven it was their oyster that caused the food poisoning and therefore she didn't really care.

As an avid traveler, I'm not used to such treatment. What a pity.

http://johndorys.co.uk/menuoffers/

This was years ago but beware what you eat in foreign countries where you don't know the source of the food. It was the first and only bad experience I had at a John Dorys, though; their fish and chips are legendary.