I used to work in Surrey and it's not unusual to see a few minor celebs. I've seen a few assorted Eastenders (most of whom I had no clue who they were until someone told me ) and various footballers. At that time I saw Grant, Anthea and his daughters quite a bit.
There's probably more BB and CBB one but I can't remember all the cast-mates- Oh yes Alex Reid- he was one- seen him, and know people who know his family well, they went to his wedding to Katie. By co-incidence another friend went to the wedding of her and her current husband. Although I don't think she's been in CBB has she-yet?
Although the way things are going even people who know celebs, or have seen them are qualifying for CBB these days so...
I've also seen Nadia, and some years before that, just after BB2 in fact- Paul Clarke at Reading Station.