Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 132,775 pages of information and 210,006 images on early companies, their products and the people who designed and built them.
Pollock and MacNab of Britannia Works, Hyde, and later Bredbury, Stockport were machine tool makers
Maker of stationary engines. 
c.1872: 16 HP horizontal engine for Greenfield & Stewart’s sawmill, Wellington New Zealand 
1879 Advert The Argus, Melbourne, 5 July 1879, for Roberts, Morris and Deakin, agents in Victoria for Pollock & MacNab, offering horizontal engines, with cylinders 11" - 28" bore, lathes with centres 7½" to 16", shaping, slotting and planing machines.
1888 Two beam engines for Alma Road Pumping Station, Ponders End.
1911 Boring and Surfacing Lathes; Radial drills. 
1911 Manufacturer of Machine Tools for the Railways.