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@Rik_Van_Looy
Quick bit of geekery....
Hi-Du-Minium is derived from that of High Duty Aluminium Alloys
(a series of high-strength, high-temperature aluminium Alloys developed for aircraft use by Rolls Royce back in the late 20's).
Reynolds started using hiduminium alloys for lightweight racing bike components in 1934 and GB started making brakes, bars and stems from it after the war.
Olympic torches in 1948 were also made from Reynolds Hiduminium - I met a lady recently who still has one from her husband, it was a proper British HTFU torch relay, he ran between 1 and 4 in the morning 20miles at the Somerset/Devon border - none of this walking 100yards in front of massive crowd whilst wearing a white-shellsuit and filming yourself with your mobile back then!!