One of the things about love island is that quite a few people have said there’s no aftercare/input from itv once people have left, only the winners. Hopefully they will change that this year, as regardless of how far people get in the show, they’re essentially just exposing people into being a ‘celebrity’ at the drop of a hat and walking away from them. I’d imagine that JK was of a similar ilk, more than likely didn’t offer any help/support to the guests to help them deal with what’s happened on the show.
Comparatively, a few of the GBBO folk have said they got lots of support from BBC/channel 4 afterwards to help them manage the fame.