Just an update on the above, found all details at the library, which confirmed where and when my grandparents lived, which confirmed everything, thanks for all the info.
Found grandmothers grave in Penarth Cemetery, not far from where I live, address listed as 9 Windsor Arcade on the records, her 24 year old daughter (my aunt ) is also interred in same grave. Grave owned by my grandfather, but he is not there, and no record of him in that cemetery. Really odd. Have to do some more research now.