I'll throw my sizing info in if it helps. The 1950s Service boot runs "big" for me at least with the turned up toe. I am an 8 in White's Classic Work Boots and got a 7.5 U.K. in my Vibergs. They fit but I could have prolly went down to...
These are the build sheets for both my White's CWB and my Viberg 1950 Service Boot, if anyone is interested.
2011 Classic Work Boot
Size 8D based on tracings
Height - 6 inches
Lace Design - Plain toe