Hello Michael and Heather,
Dr Esler was my grandfather and I have just been to Datchet with my 90 yr old mother to reminisce about him ......he was a GP there for many years.
His father was a GP in Peckham at the address you describe and I live quite close in Herne Hill.
He is featured on the IWM website in an oral history recorded in 1970s. Extracts are in Forgotten Stories.
Regards,
Jim