He has kindly sent the following photos, one of a Snowdon family group, and two atmospheric photos of the locality for which I am extremely grateful.
Back row: Nicholas, Margaret, William, John, Jane Ann, Ellen
Middle Row: Isabella, John (Father) Margaret (Mother) Evelyn (Baby), Anthony, Esther
Front Row: Annie Lydia, Thomas (with boat), Samuel
Compare the above photograph to that below left on the iSee Gateshead website. It was taken c1900 and shows the house standing some distance from the tree-lined river-bank, with Archie's washing hanging on the line among the trees by the outhouse.
Below are three photos sent to me on 18th August 2013 by Nick Snowdon, grandson of Nicholas Snowdon in Chris Richardson's family group photo (see comment below).
'Mr John Snowdon - gardener, at work in the Heddon Vicarage Garden. He died aged 80 in 1928. Photo courtesy Mrs I. Snowdon.'
In one property in Heddon Square was John Snowdon (56, born Keswick, Cumberland) who is described as a Stationery Engine Driver, his wife Margaret (54, born Ovingham, née Curley), daughters: Esther (29, Dressmaker), Jane Ann (22), Ellen (19, Clerk in CoOp Store), Annie Lydia (15), Evelyn (8) and Joyce (6), and two sons: Samuel (14) and Thomas (12). It seems likely that John Snowdon is the man ('Snowden'), described in the Heddon Methodist Church Centenary Magazine as having been converted in the Heddon Methodist Revival Meetings around 1860. He was one of the people instrumental in establishing the Methodist Chapel in 1877. It says he was employed as Brakesman (Stationary Winding Engine) in the Pit and lived in The Square where most of his 16 children were born.
Heddon Square was in the centre of Heddon village next to the Swan pub but the houses were all demolished many years ago. If the Snowdons were still living in one of the Heddon Square terraced houses at the time these photos were taken (the 1911 Census may help here), this is the first photo we have seen to date of the Square itself.