I'm Sorry I Haven't a Clue, Series 9

The 1979 Christmas Ball was broadcast on 24th December 1979, and was the show's first Christmas Special, and the last show of the 1970's. This was the 67th I'm Sorry I Haven't A Clue show to be broadcast, with Graeme Garden being the only person to appear in all 67.
It was the first show to feature 10 different games, it also had two rounds of Mornington Crescent.
It featured Humphrey Lyttelton in the chair with Graeme Garden, John Junkin, Tim Brooke-Taylor and Willie Rushton, with Colin Sell at the piano.
SPOILER ALERT
A Pro/Celebrity Special version of Mornington Crescent was played. The Special Guest joined Humph, but was not introduced. Humph explained The Parallel Transfer Rule - Any team that gets 2 positions ahead of their opponents can transfer to a corresponding position on a parallel route without losing a turn.
The first round was played so the special guest could get used to the rules. During the second round Willie got to Mornington Crescent before the guest got to join in. Humph then apologised to 'Sir Alec'.
The BBC received complaints that Sir Alec didn't get to join in!

[@TheBrotherSean]

Much of this travels quite well over the years, but plenty that does not.

[@HarryNicNicholas]

i've opened the door to barry cryer, they used to rent office space from us when i worked for cfx in d'arblay street, soho in the 90's

[@rheaandnicdaw4356]

I thoiught i was a video!.