'Mantha has underestimated Lynne's knowledge of popular culture. She feels she has to insert the prefix of 'the TV series' before she says '24', however later we learn that Lynne not only knows the TV series, but also its main character. What sort of confusion was 'Mantha expecting? Would Lynne think that Sammy is a fan of the number 24 and 'Mantha was making light of his spiral into dementia and increasing obsessive compulsive disorder? Would Lynne think that Sammy has to do everything 24 times lest he gets into a panic and then starts having trouble breathing?
It seems quite light outside but Sammy is racing to get to last orders. What time of year is it? Even if it is in summer it will still be dark outside as last orders in pubs is traditionally at around 10:45pm, but can be as early as 10:35pm. This would make the time, at the earliest, 10:11pm and that would still be dark enough even at the height of summer. On the longest day of the year the sun could set as late as 9:22pm, but twilight only lasts for about 18 minutes, thus making it darkness at the latest 9:40pm; a good 30 minutes before Sammy has rushed out of the door. This leads us to two conclusions: either Sammy has mis-set his watch or he has lots of lights in his garden.
There is a case that Sammy has forgot to wind his watch forward at the onset of British Summer Time, but this is unlikely as it would still make the time 9:11pm, but still too early in the year (or is it late in the year?) for it to be light at that time. So the only solution is that Sammy has fixed a number of bright halogen lights in his front garden. Looking at his front garden, it does look like there are an awful lot of trees surrounding the house. It's as if the house is in a forest. Perhaps this is the reason for fitting the lights. The surrounding vegetation was blocking out so much sunlight that it was constant twilight in their front garden, which constantly confused Sammy about how much time he had to get to the pub.