I think that 'your' Charles Sands is the one whose birth was registered Sept.qtr.1885 Wisbech, mmn Herring. He was the son of Charles Sands and Elizabeth Herring who married Dec.1878 Docking.
According to census he was born in Terrington but later lived Heacham (which he gives as birthplace in 1911). In 1901 he is shown as inmate in Boys Home Reformatory in Wandsworth, London.
So, although he gives birthyear as 1884 in 1939, I think he was born 4/7/1885.
Annette