There is a 3 CD boxed set of Flanders & Swann released by EMI some years ago as The Complete Flanders & Swann. May still be available. I found my set in a charity shop recently for $5. (Now I can eBay the vinyl!)
I'm sure many readers will be familiar with the Hippopotamus Song(Mud, Mud, Glorious Mud), for which they were also responsible.
And I still get a laugh from The Gas-Man Cometh, that great ode in praise of the British worker.