Paul, once they get a taste for them they will crave them and follow you round the loft thinking you are going to give them some, but for some reason if YBs aren't given them when really young they dont eat them straight away and struggle to pick them up, so its best to cut them into quarters at first. Human comsumption red skinned peanuts are the best.
Stuart, yeh ive been told not to give peanuts by some people as I think it does something to their insides, but have also read of a fancier who only ever fed his pigeons on peanuts, and would have numerous birds high up in nationals. Ill try and find the link on the new, it was titled "unroasted peanuts - the secret weapon"