Frankie trusts his internal clock
Here's a description of the contestant's attempt. Someone's probably working on collecting some images to illustrate it.
Frankie decides that, having been a stand-up comic for many years, he can probably rely upon his internal clock to estimate when his 20 minutes are up. He therefore spends his time focusing on coming up with the list of 40 words. He starts his list with the word 'progression', and then follows this with 'progressive'. Alex checks in with Frankie a couple of times, to see how long he thinks he has been in the caravan. At 4 minutes and 46 seconds, Frankie estimates he's been in there about 5 minutes, and at 9 minutes and 14 seconds, he estimates he's been in there for about 9 minutes. Other words on his list include 'jolly', 'lolly', 'sorry', 'silly', 'willy', 'lamp', 'rams', 'ram', and 'no'. He eventually decides that he's been in the caravan for 20 minutes, but notes that it's also possible that he's just panicked at the 17 minute mark. In the studio, Alex reveals that Frankie actually left the caravan after 23 minutes and 21 seconds. He ultimately ends up in second place.
(Written by Karl Craven)