I always thought those were flogged off cheap because of the boiler hand-rail foul-up. Of course, having passed it by at the time, I now regret not buying one because we won't see those sort of prices again🙄
Tourret page 60 claims "The earliest oil boxes used on the GWR were the proprietary 'OK' type" - certainly suggests it was a manufacturer or brand name?
“Top hole. Bally Jerry pranged his kite right in the how's your father. Hairy blighter, dicky-birdied, feathered back on his Sammy, took a waspy, flipped over on his Betty Harper's and caught his can in the Bertie.”
And wasn't the roof too rounded? Going from memory there, so might be wrong, but I know I didn't buy any at the time.
Hornby have produced some damned good wagons, but this isn't one of them😕