Jan Dyson and Thawpit

And while I'm on, the 'bottle Thawpit' that Jannie adds to her shopping list in Towards the End of the Morning was a proprietary stain remover - actually carbon tetrachloride, long since banned as highly toxic and possibly carcinogenic, so I hope she used to keep it out of Damian and Gawain's reach.

Pooter and Kinahan

It appears that the 'Kinahan' that Pooter sends out for when he has a cold was a kind of branded whisky. That explains his chagrin when Sarah comes back with the own-label version for 2/6 (2d back on the bottle) and plonks it on the table in front of his friends.

Campbell Dodgson, and something not a lot of people know about him

It seems that not only was Campbell 'the second master objects to this' Dodgson indeed related to Charles Dodgson, as I half suspected anyway, but also that, 30 years after Babbacombe when he was Keeper of Prints and Drawings at the British Museum, his chauffeur had a cookery-obsessed son who the world would come to know as Len Deighton.

Or to put it another way, Campbell Dodgson's chauffeur was Len Deighton's father.