[JAS84]

Didn’t Deal or No Deal start at 6 days a week? It was certainly 6 days from pretty early on. Countdown went to 6 days a week for a short while too.

With regards to the celebrity specials, I think that only happened at a time the daily show was already flagging and it probably needed to bring something more to justify its existence.

Of course one of those celebrities had been on the show before - Olly Murs had been on there as a civilian before he became a famous pop star! That must've got them some publicity at the time.