Food Safety Reports: Burger & Beyond, Camden Lock Market, London, UK

I have just got back from the hospital with my 10 year old son. I ordered him a cheese burger today from Camden- burger & beyond. My son ate nothing else, apart from one of his normal packs of crisps!
I know it’s this burger and I want to see if anyone else has been affected today?  | Symptoms: Nausea, Diarrhea, Vomiting, Stomach Pain, Fever, Cramps, Chills, Headache