I asked my cousin about this as she used to live in Canadian Avenue. She is 81 and said this, I thought it might be of interest:
I knew this bit of local history as a child, probably told by my grandparents, Herbert Alfred and Florence Dalton, then living at 48 Canadian Avenue on the corner of Fordmill Road. They had previously lived at No.73, but Nana had always coveted the corner plot of No.48. As you know, No. 48 remained in the Dalton family until the late 1960s., having since been “redeveloped” into small flatlets.
BERLIN ROAD was originally laid out c.1879. The first five very large houses were built in the early 1880s (all had names, but were later Nos. 7 to 15). Most of the other houses in the road were built in 1899, including Nos. 73 and 48.
During the First World War the Canadian Forestry Corps was based at Catford, and in 1918, on the day after Armistice Day, BERLIN ROAD was renamed CANADIAN AVENUE in its honour. The Corps Band paraded “an unflattering effigy of the Kaiser” through the streets before the Canadians personally tore down the old street signs. (per “Lewisham & Deptford In Old Photographs” collected by John Coulter, published 1992)
The beautiful trees were planted to commemorate the Canadian service personnel who died in “The Great War” and thus BERLIN ROAD became CANADIAN AVENUE.