As with every factor of WWII things become more and more intriguing the more you look into them.
Who knew that Lagonda made flamethrower vehicles*: Lagonda flamethrower - Wikipedia
(^ that also indicates why the AA flamethrower might not have been such a stupid idea after all).
The Petroleum Warfare Department didn't just look at ways of blowing things up in mighty fireballs and torching Germans. They were also responsible for sensible stuff like PLUTO and FIDO.
(*Apart from the bloke who wrote the Wiki page)
I want to look at the PWE in a book as I believe no ones done it yet. It's one of my topics (Other two are the Vickers Medium and the Home Guard) for after I've finished the Second World War British rocket book.