Thank you to everyone who replied. With the exception of miriamkinga, you all have the correct family. Having now found out George Mullers father was Frederick it explains why a grandson was given that name.
I have traced back on Clara Whites side a bit and can find her with her family right through 1871-1911 censuses. However, I have yet to find George prior to the 1991 census and he is also missing from the 1911 one (but Clara states married - not widowed- so I presume he was away for the census night.)