Actually it's a scene from The Dinky Doos Investigate.

"Tell me the best, Susie," Mikey chortled. "Have you been banished to the outer limits?"

"Au contraire, mon petit frère, I've been admitted to the inner sanctum. Behold - dad's newest trainee estate agent - and heir apparent."

"I don't believe you," Mikey spluttered.

"You'd better - I've got the tape measure and evidence to prove it."

"No, you haven't."

"Stop it, Jeffrey."

"Stop what, Susie."

"Obsessing over whether 'a' or 'the' makes the line funnier."

"One wrong little word can kill the comedy, Susie."

"Not with me, Jeffrey - I could read from the list of Huntingdonshire cabmen and still raise a horse laugh."

"I think that may be a joke too far for here, Susie."

"As is a lot of our stuff, Jeffrey, but we can't do anything about it now, so let's expend our energy on some pre-publicity and see if we can waylay a few new unsuspecting readers."

"Phew, what a scorcher, Jeffrey! October the 1st is early this year."

"I blame the EUSSR, Susie. They're sending us their overheated, continental air and probably scheming to plunder our newly discovered gas reserves in return. The sooner our maritime climate reasserts itself, the happier I'll be."

"Hear, hear, Jeffrey, bring on the equinoctial storms, and let's turn our faces to the open seas. We've had more than enough trouble with dog days this autumn. It's not natural; the next thing you know, neutrinos will be travelling faster than the speed of light."

"That's a job well done, Susie."

"What have you been fiddling away with, hunched over like that, Jeffrey?"

"I finally managed to force myself to reread our first nine chapters, and I've inserted a multitude of missing commas."

"Come again."

"That's right - our comma count has increased from 1,553 to 2,216."

"Sometimes, Jeffrey, I worry about your pernickety attention to detail."

"I didn't tot them up by hand, Susie."