GB (Gerry Burgess) are worth checking out, made aluminium brakes, bars, and stems since 1945.

I'm looking at rebuilding a 1960s Holdsworth so I've been checking out the options and for bars I like the look of GB Tourmalet
(they've also got the same reach and drop as my 1982 bike). Several of the GB bars have 'GB' and a UK outline engraved on them.
Picked some up on ebay for £30 (with a free Ventoux and some cranks). I'm not certain of their exact date but early 60s is about right.



On Ebay I'm currently seeing GB Hiduminium spearpoint stems for £24