From what I can ascertain this was from a contract (C/R 12046 26th November 1941) for 1,000,000. Cost per 100 - 17 15s 0d and 8 15s 0d for the 300,000 made from “free issue blanks”. Taylers were a small operation, almost in the centre of Birmingham – New Hall Works, which backed onto the canal. I doubt they had the room to make Bofors cases there and probably opened a satellite factory in Tipton, a safe distance from the city.
Other than the railway companies the only other contracts for reforming 40mm cases was Willey & Co. (Engineers) Ltd of Exeter. Their main business was the manufacture of coin operated gas meters. Their listed monogram is “W. EX”. However, they also had a factory in Leicester. It might be that that WLE (more probably WEL) is a play on that.
It appears that during WWII the Exeter factory was involved in a wide range of engineering from parachute containers through to steel floatation tanks for Mulberry harbours.
TimG
P.S.
The adaptor –
JRS - J. Rawsons & Sons Ltd of Tunbridge Wells, Kent – Automobile engineers