And thanks for the suggestions about the steps. I think Southend is a possible. We have photos of the same family on beach day outings around 1935-1937 from Ramsgate, Margate and Southend. So I think it's likely if they went to the beach in 1921 they would have gone to similar places. I spoke to an expert on the watermen's stairs of the Thames a while ago and he couldn't place it, so I think it's more likely to be at a beach/coastal place like Southend. Would be interested to see your photos if you have similar ones...