I do believe I may have found Walter Noel Rees’ place and date of death.
On FamilySearch there is a record which shows a Walter Noel Rees, born 1886, who died in hospital in Dublin on 28th December 1962.
I have ordered a copy of the death certificate from the Irish GRO, which should confirm this, or otherwise.
I will post further when I have received this certificate.