Florence Phoebe Amelia Hudson and her son Jack Pateman

This photograph is of Florence Phoebe Amelia Hudson and her son Jack Pateman. The inscription on the reverse reads "Home on 48hr leave back from Dunkirk. 1940". Jack's forage cap has a chequered design, similar to some Scottish Regiments style. Does anyone know which Regiment he served with? And who is the little boy in the foreground? This is another of the delightful photographs given to me by Ken Turner.

Florence was born in 1895, and so was 45 years old in this photograph. She died in 1987.