It’s unlikely that they contracted the virus at the show, because their symptoms first appeared on Monday, but it’s possible they may have been infectious on the Saturday. Those known to have been in close contact have therefore already been notified, and thankfully all have tested negative.
However, others who were at the show may wish to take a home lateral flow test themselves, just to be on the safe side. If you don’t already have any, they can be ordered for free.
ROUGOL says that the person affected had already received their third vaccination, and is feeling okay, other than suffering from boredom because they are isolating at home and therefore can’t pop to the library to get ‘real’ books!