Does anyone know where I can get black rocks near to bolton?

you'll be best talking to this fella.

only way to get proper black rocks

Peter Siddons is the only breeder of the Black Rock, anywhere at all. There are no other breeders of Black Rocks. There are a number of people who grow birds on for sale.

He is not online so all enquiries must be by phone or by letter :-

Mr P Siddons,
Muirfield Hatchery, Muirfield, Drum, Kinross,Scotland KY13 OUN
Tel: 01577 840401
Fax: 01577 840402

he will be able to put you in touch with your local agent if there is one

hatcheries may sell something called a bovans nera which is a copy of a black rock. basically similar crosses from similar strains, i've got some and they do everything black rocks are supposed to and look the part.