I read Laughing Gas. A super book, which I know Teresa likes a good deal too from comments earlier in the thread. It is a nicely done 'body switch' comedy. I especially enjoy it when Plum makes small but endearing links to his larger world of Drones and the idle rich, as he does here. Reference is made to friends of the book's protagonist as members of the Drones Club, notably 'Barmy' Phipps and 'Oofy' Prosser, despite this otherwise being very much a standalone book (set mostly in Hollywood).
Speaking of connections between books, I know Wooster very occasionally refers to Blandings in passing - but does he ever go there, or meet any of the Blanding cast in any stories?