Re:
From Wikipedia
Expansion and mergers
While bicycle production had steadily risen through the mid-1950s, the British market began to decline with the increasing affordability and popularity of the motor car. For much of the postwar era, British bicycle manufacturers had largely competed with each other in both the home and export markets, but 1956 saw the formation of the British Cycle Corporation by the Tube Investments Group which already owned Phillips, Hercules, Armstrong, and Norman. In 1957, Raleigh bought the BSA Cycles Ltd., BSA's bicycle division, which gave them exclusive use of the former brand names New Hudson and Sunbeam. Raleigh also already owned the Robin Hood brand, and Three Spires with Triumph (cycles) also at their disposal.
From Wikipedia
BSA had itself acquired Triumph Cycle Co. Ltd. only five years previously. Ti added the Sun bicycle company to their stable in 1958, and with two "super groups" now controlling a large portion of the market, it was perhaps inevitable that in 1960, Tube Investments acquired Raleigh and merged the British Cycle Corporation with Raleigh to form TI–Raleigh, which now had 75% of the UK market. TI–Raleigh then acquired Carlton Cycles in Worksop, England that same year, at the time one of the largest semi-custom lightweight makers in the UK. Ti Raleigh gave total control of its cycle division to Raleigh and soon set about marketing many of the acquired names as budget ranges, though with Raleigh frames. The old British Cycle Corporation factory at Handsworth continued to produce non Raleigh branded product well into the 1970s, with Raleigh branded models built in the main plant at Nottingham. However, the Sun branded bicycles were made in the Carlton factory at Worksop, England.
Martyn Young (Late 1960s?) build - Part II - The Rebirth