Hello, thanks for all the extra information you gave!
Here are some dates and information about some of Gertrude (Mary) Hardy's siblings just so you know the dates:
JOSEPH ANDREW ROBERT GOLDSMITH (named after his dad Joseph Andrew Goldsmith and his grandad- Robert Fisher). Joseph was born July 1919 in Kings Lynn, Norfolk and died in June 1980 in Norwich. According to burial records he was buried on May 12th 1980 in St Ethelbert, Norfolk. He married a woman called Elizabeth M Wilson in 1946 in Kings Lynn Norfolk. I think she might have died (or they divorced) and he re-married to Joan Elvin in 1977 Depwade, Norfolk.
SIMON HAROLD (known as Harry) GOLDSMITH was born in April 1921 in Kings Lynn, Norfolk and died in 2006 in Kings Lynn, Norfolk. Not sure who he married, you may know.
JESSIE ELEANOR GOLDSMITH born May 1922 in Kings Lynn, Norfolk, she died in September 1987 also in Kings Lynn, Norfolk. I think she married Eric Gordon Neal in 1958 in Kings Lynn.
CHARLES E GOLDSMITH was born in December 1923. His birth was recorded in Cardiff, Glamorganshire- I'm assuming as this is the only Charles Goldsmith born with mmn Fisher at the right time, and you mentioned them travelling to Wales I think. He died in March 2000 in Kings Lynn, Norfolk. Not sure who or if he married, again you may know this.
STANLEY DAVID GOLDSMITH was born in August 1925 also in Cardiff, the same as older brother Charles. Stanley died in 2002 in Kings Lynn, Norfolk.
WYNDHAM RAYMOND GOLDSMITH (his middle name, Raymond, is where your grandfathers brothers name comes from) was born in January 1927 also born in Cardiff. He died in May 2006 in Kings Lynn, Norfolk. Wyndham married Sheila M Hutson in 1952 in Kings Lynn, Norfolk.
IVY M GOLDSMITH was born in 1928 in Cardiff, and then sadly died young in the same year in Cardiff (not sure if she lived months or just days)
some more specific birth dates you might want:
Gertrude Maud Fisher (became Goldsmith when married) was born January 5th 1898
Harry Goldsmith (real name Simon) was born April 5th 1921
Wyndham Goldsmith was born January 14th 1927
Charles William ''Bill'' Hardy was born November 19th 1919
Gertrude Mary Goldsmith was born 17th May 1917