Hi again, Bab,
I've just come across a reference to the "Acme Spinning Co. Ltd" - not sure whether this refers to the Acme Mill, but is says that the Salford Archives Centre has a Minute Book 1904-1920 (U 280/AM 1).
No idea what it might contain, but there could be a mention of some of the people who worked there...
This is from a little book I bought recently, "Records of British Business and Industry 1760-1914: Textiles and Leather" produced by The Royal Commission on Historical Manuscripts.
And, Milly, you need someone who has a bit of local knowledge about Pendlebury Hill to come on here and answer your question - they are certainly out there somewhere! Good luck...
keith