Thanks to the brilliant guidance on here, I was just able to check the addresses in Slaidburn Street, Chelsea. I'd expected to find my grandparents and other members of the family (they were mainly houses of multiple occupancy) - in 1934 my grandparents were on the electoral roll at number 45, although they had also lived at no 44. Checking the list of house numbers, all the numbers are consecutive but annoyingly stop at number 43 and resume at number 49.
So frustrating!
Guy, what am I missing this time? You've been so patient and informative, perhaps they would have been on the later register you mention, although I don't know why a run of houses would all have failed to respond. 
Pat
Those missing numbers are not just redacted in the normal sequence.
Number 43 is the last few people on 0106d/008 (people 40-42)
Number 49 is the first few people on 0106d/009 (people 1-8)
There are no side roads coming in, that those missing numbers could be attached to.
My understanding of that is that either those addresses were empty or were caught later, in which case they would either be grouped together at the end of the area or in a special register that has been mentioned on here.
Interestingly, I cannot find any of the people shown on the 1939 electoral roll living at 44 to 48 anywhere under the Chelsea district. Obviously some of those would be old enough to vote, but too young to show in this register.
Many of them are still there on the 1945 electoral roll.