It looks very similar to my Bromwich frame (which is also hanging in my garage waiting for some tlc) The stop for the brake cable looks different- mine is straight but the rest of the braze ons look the same. Almost all Bromwich frames were made to order and as such most differed in some way.
Mine was used as a hack bike by a mate that lived on a narrow boat and as a result the bottom bracket threads have rusted out and needs a repair..
The whole thing needs shot blasting and re-painting - stuff i sadly don't have time for sadly. - the comment about loosing your fillings is about right - i used a flex stem on mine back in the day - still got it and most of the Shimano deore dx group (circa 1990) that went on it.