Daniel, I have in my hand a copy of Rock Climbs in Lancashire and the North West, 1975!
I lived in Preston 1981-82 and did quite a lot of climbing in this area. Brownstones was excellent for bouldering. The Wilton quarries were great, but you need to be climbing at least HVS to get the most from them. Cameo was an absolute stonker in Wilton 1.
Cadshaw and Anglezarke are also very good. There's a good selection of routes of all grades, especially at Cadshaw, but you can always stick a top rope on the harder ones. Keep on pushing!