If it ain't got a makers name then it's a Kodak from Welwyn Garden City. But have been informed that that isn't strictly correct as Kodak have/had facilities all over Hertfordshire. But there it is!
The Kodak ones always seem to look a bit rough but are pretty good internally
But around the 15232 area, there seems to be a bit of an overlap between the Watsons and Kodaks and I haven't quite managed to pinpoint a GOOD ball-park change-over number