Thanks Carole.
The Normanshire Drive address in Chingford seems to be a deadend. I thought it might be where his parents were living at the time, but based on the 1939 Register, there was no Webb family there in 1939. However there about 20 houses which come up with no occupant recorded. In fact it looks like Arthur's father Joseph Webb, master tailor, may have been living in Fulham at the time.
I note that Ethel is being a little economical with the truth over her age, considering that she was born 6 Oct 1913.