So revisiting this ( many years on) with the benefit of more Census data

There is a property named Avondale next door to the Nags Head Inn on Plump Hill/Mitcheldean in the 1939 data set. https://www.gloucestershirepubs.co.uk/pubs/nags-head-plump-hill-nr-mitcheldean/

in 1901 Joseph MERRY lives at The Firs on Plump Hill, not too far away from the Nags Head Inn ( no Avondale listed, to be fair few properties are named)

in 1911 Frank MERRY is living at the Firs

today that address is
THE FIRS
PLUMP HILL
MITCHELDEAN
GLOUCESTERSHIRE
UNITED KINGDOM
GL17 0ET