Many thanks, Beds Boy.
When you say "Unfortunately the Richardsons don't appear to have baptized a boy Matthew though", do you actually mean that the Haradens don't? The Richardsons were the family she married into?
(They then remained in Potton for another five generations: their son William Richardson, 1737 - 1802 who married Mary King was my great x6 grandfather; their son Richard Richardson, 1765 - 1849 who married Mary Holden was my great x5 grandfather; their son George Richardson, 1808 - 1888 who married Elizabeth Giddins was my great x4 grandfather; and their daughter Emma Richardson 1831 - 13.8.1899 was my great x3 grandmother. She entered service in the household of Murfin Blott (wonderful name, that ...) in the Huntingdonshire village of Great Staughton, and when my Great x3 grandfather James Hardwick (1821 - 13.1.1890) was widowed, leaving him with two young children, he married Emma Richardson in 1853. They had six children together, including my great x2 grandfather William Hardwick (b. 29.6.1860, d. after 1911) and they are both buried in the same grave in the centre of the old burial ground at Great Staughton with a rather impressive (and still largely legible) headstone.