It's a very convoluted tale, the history of Tube Investments and the UK cycle industry.
Basically, they ended up owning pretty much all of the bigger cycle brands in time, excluding all of those bespoke, small scale lightweight manufacturers so beloved of us Brits.
T.I. was formed when several companies involved with the manufacture of metal tubing amalgamated together in 1919.
One of these companies was Accles & Pollock who were already well involved with cycle tubing products for frames, forks and stems (A & P's 'Ankh' symbol trademark may be familiar to some of you with vintage 'Major Taylor' style stems).
Within a year of being formed T.I had also acquired 'Phillips' (1920) who were, as mentioned previously, the major supplier of cycle components to the UK cycle industry.
In 1928, they also acquired 'Reynolds Tube Co.' and pretty much cornered the market in cycle tubing supply to almost everyone, at every level of production.
Their next major cycle related acquisition was when they purchased 'The Helliwell Group' in 1946, which included the 'Hercules Cycle & Motor Co.'
By 1950 the T.I. cycle division included Hercules, Armstrong, Norman, Brampton and Phillips.
This roster was added to in 1950 when they also acquired 'James' cycles division.
In 1956 T.I. formed the 'British Cycle Corporation' which included all of the aforementioned companies (excluding 'Reynolds') and 'Walton & Brown', manufacturers of steel pressings; if you have a British bike with a fork crown cover, 'W & B' probably made it.
Cycle brands they were using by this time included the aforementioned, but now also Aberdale and Dunelt.
Production was concentrated in a huge factory in Handsworth, Birmingham and many staff from outlying factories were made redundant as this happened.
In 1958 T.I. acquired 'Sun Cycles & Fittings Co.' and 'Wright's Saddles'
In 1960 T.I. finally acquired 'Raleigh Industries' and all of the cycle brands they owned at that point: Raleigh, Robin Hood (1906, relaunched in
or around 1939 after layingdormant for years), Humber1932), Rudge-Whitworth (1943), Triumph (1954), BSA (including the Sunbeam and New Hudson marques) (1956), J.B.Brooks (saddles) (1959).
In 1960 all production was concentrated in Nottingham.
'T.I./Raleigh' also acquired 'Moulton' in 1967.
Raleigh also owned 'Sturmey Archer'; or rather it was a separate division of the holding company; it was basically part of the business since 1908, but a whole other difficult story.
So, if you have a bike from any of the manufacturers listed anywhere above, made from 1959/60 onwards, they were all made in the same factory in Nottingham (with the exception of Raleigh's SBDU division, which is a whole other can of worms to open, which I'm not even going to contemplate!)
I hope that helps! Not!