Reginald Mobberley was born Dec quarter 1895 Registration District Stourbridge, reference 6c 172. This is enough to get you Reginald's birth certificate.
I can't find him in 1901 either, but I note his father, Samuel, had died just prior to the Census, in which case I expect Reginald was staying with a relative. The 1901 Census was held on 31 March, but the entry in the death index is for the June quarter 1901 i.e. the event happened too late in March to be included in that quarter's returns. That reference btw: Stourbridge 6c 89 and Samuel was only 38.