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@Big_Block
Stems: depends on how period correct you want to be.
The GB spearpoint is too recent for the original owner to have bought in 1947.
Below is the writeup in The Bicycle Vol 25 No 641 of June 16, 1948
There was a distrust of alloy bars and stems and this review focuses on the durability of this new material (also the reason for the steel ferrule for your alloy handlebars was that they didn't trust alloy bars without the extra support)
I am unsure when the GB 'girder' style was introduced as in the 1952 Brown Bros catalogue, the spearpoint was referred to as the 'ordinary' and there was the other option of the 'girder' design. However, the girder design in hiduminium was available pre war (see 1939 Brown Bros catalogue p 143) but it was made by Reynolds. I don't think GB was around then as a manufacturer.