I don't have the UK standard but for bantams in the US, the weights are:
Cock- 38 oz
Cockerel - 34 oz
Hen- 34 oz
Pullet- 30 oz
I found this on the internet:
Bantam Cock: 2 Kg, Hen: 1.6 Kg.
which converts to about 4.5 lbs and 3.5 lbs
And is still smaller than what is widely available now.
I am going to be dispersing my bantam chocolate orpington flock this fall. I have pure english adults and some started birds that are 75% english and 25% Don Chandler black. These are true bantams, not the 5-6 lb birds others have been offering.
Please contact me by pm if interested.
Don,
Have a few chocs and black/splits on the ground now. Only a couple hens laying. I have had good fertility from the eggs I am getting, no trimming either.
No stubs so far!!!!! I plan to put the girls in with the pure english bird in a month or so to see how the chicks turn out from...