I lived at no 40 Church Road, from 1952 to 1970, which was directly opposite the houses you mention. I clearly remember them being demolished and the pre-fabs being put up - in the late 1950s. The pre-fabs are numbered in the 30s so I'm not sure why one should have number 7. I will ask my mam, who is 95, as she may remember why they were replaced.