Their address is sometimes given as New Prestwick. The ages vary. Most say Annpit Quarry, a couple say Bell Rock Quarry.
"A Brief History of Prestwick Toll" by Jim Mitchell
Mentions Bell Rock Quarry, Bell Rock pit and Ann coal pit. Coal pits were vital for the salt panning industry which happened on that stretch of coast for centuries.
Includes extracts from old maps. An account of an accident in 1820 at the recently opened Ann coal pit. According to what I can read in the accident report Ann pit was at Bell Rock quarry.
www.prestwicktoll.com/history/?msclkid=75ce2cbacef611ec8f77e462d537c70b
