Dear Val
Just checked the Lancs Online parish clerk website
www.lan-opc.org.uk - no listing of Mary and James's marriage but a couple of possibles for parents: -
St Mary's Manchester 21/4/1822 James Shackleton, bachelor, grocer and Charlotte Arnold, spinster
Also St Mary's 21/3/1830 Edward Beaumont, bachelor, cotton spinner and Sarak Cook, spinster (makes her mark)
07/07/1825 John Beaumont, bachelor, cabinet maker and Sarah Moorhouse, spinster, marriage by licence.
Best of luck with your research
Maria