The location, I think, is in the Silvertown area of Essex ... the date I'm a little less certain about, but probably turn of century depending upon whose son that is centrally in photo.
The two gentlemen are William and Hugh McMarth. Both sugar refiners at Lyle's at Plaistow Wharf, who lived at 9 & 11 Boxley St/Rd, North Woolwich, in 1901. They were two of the original workers at Lyle's photographed in 1892 outside the works (they look a little younger in that photo). Over time 4 generations of McMarths worked at Lyle's.
William McMarth was one of my Great Grandfathers his daughter Elizabeth was my Fathers mother my Father and I both worked at Tate&Lyles Plaistow wharf.
I wanted dating of this picture because none of the ladies or children in this picture resemble the wives and children of William and Hugh and I thought that the photo was much earlier. However from previous posts re this picture's age and the style of dress of the subjects it is probably late 1890s. I think this photo was taken in Ireland, a cousin has since told me that the she was told that the two men visited Ireland a number of times, the ladies in the picture have a strong likeness to the brothers it is possible that they may be mother and sisters with their own children.
All I have to do now is trace William and Hughs mother's records they were from Coleraine originally.
Thankyou all for your help
Peter Richards