Watchdog sent their hygiene expert over to advise the hotel in order to at least find the cause. She found a clean, well managed hotel and nothing at all that would explain the illnesses. Certainly nothing like the things described in the newspaper report and it wouldn't take an expert to find those.
The cases referred to are from 2009 - I can't remember exactly when it was featured on Watchdog but certainly not as far back as 2009. So maybe we can conclude that the hotel has put things right - and still gets bad publicity 5 years after the event.