Not of much use, I know, but about 11 years ago, I visited Upton's yard at Corowa, in New South Wales. They were clearing the last metal out of the yard, but there were still tank and vehicle parts laying around. The place was a source for many collectors in Australia over the years, I came across a huge mound of carbons, all marked "GEC Made in England", must have been several thousand. If only I had bought a load :-(