Well, helpmetoo, I went along with a retailer client for the training session.when he became an outlet for the lottery. He was a little late applying for it so Camelot had had experience of dealing with winners.
They showed us the room where they presented the cheques to the winners. They said it was completely confidential if the winner so wished.
However if a news reporter or anybody else sat outside the building -- a tedious job -- they would be able to see winners turning up for their winnings.
Sadly, although I went along to the building for the training, I have not had the enjoyment of going to pick up a large cheue!