Hi Tim,
I'd be very surprised if this is English. In the old days we always said that if it has a yellow tint it's Czech, but that was really just used as a rule of thumb as a characteristic - which should be combined with others.
The style of engraving is not really British in my experience, and the handle is not consistant with anything that comes to mind by Webb or Stuart.
Sorry to be so negative, but sometimes it's necessary to discount stuff before concentrating in another area.
Nigel