Dear Mr Chianta,
I'm afraid there's nothing more the RSPB can do at this stage. Generally we don't tend to perform inspections of farms unless a formal complaint has been raised by someone with either first or second-hand evidence of cruelty towards an animal . Really the tone of Mr Hawker's emails wouldn't be enough to justify an inspection.
I'm sorry I can't be of more help, and my apologies for the delay in getting back to you.
Fowl and Game Officer, RSPB