These are the things that stop me and The Old Man getting bored during the winter.
It seems I last blogged about it in September. Since then The Old Man has spoken to the people in Haydon Bridge. There is indeed nothing to prevent you breeding your own blackrocks, and, let's put it politely, anyone who says otherwise is simply trying to uphold their current monopoly.
We've become converts to Practical Poultry - the back numbers are a mine of information. So we read up on Barred Plymouth Rocks and Rhode Island Reds.
The probable way ahead is to buy a good RIR cock, and half a dozen BPR hens. They'll of course produce eggs for us meanwhile, but will in due course produce blackrocks, too; (the BPRs are easily broody, apparently).