Royal Enfield's factory number 4 was located in Feckenham, about 6 miles from Redditch, in the location of a former needle factory overlooking the village green. According to various reports it appeared to continue as a private residence. Here is a picture from the 1950's,
Sometime ago we were theorizing if a certain google maps picture could still be the factory. Now google has added street view and we can confirm that the factory is still standing!
What we thought was a sign on the neighboring house was actually a boarded up window, now housing a satellite dish,