Metropolitan-Vickers Electrical Co Ltd was the new trading name given to British Westinghouse Electric and Manufacturing Co on 8 September 1919. The predecessor company had sold its controlling share to the Metropolitan Carriage Wagon Co in 1916 in order to gain membership of the Federation of British Industries. In 1919, Vickers acquired the Metropolitan Carriage Wagon Co, along with its controlling share in British Westinghouse, prompting the change in name to Metropolitan-Vickers Electrical Co Ltd. The American owned British Westinghouse had established its English operations at Trafford Park in 1899, and Metropolitan-Vickers Electrical Co Ltd continued on the same site from 8 September 1919. The company was initially known for its electricity generators, later diversifying into the manufacture of steam turbines, switchgear, transformers, electronics and railway traction equipment. The passing of the Electricity (Supply) Act in 1926 provided a boost to the company’s post-war fortunes, with the creation of the National Grid generating demand for the company's products. In 1928, Metropolitan-Vickers Electrical Co Ltd merged with its rival British Thomson Houston Co Ltd, retaining both names for trading purposes. The following year, on 4 January 1929, Associated Electrical Industries Ltd (AEI) acquired Metropolitan-Vickers Electrical Co Ltd and the British Thomson Houston Co Ltd. Again, both trading names were retained, and a fierce rivalry was established between the firms which the parent company was unable to control. In 1931, Sir Felix Pole joined Metropolitan-Vickers Electrical Co Ltd as its new chairman. He oversaw a period of expansion for the company leading into the Second World War. In 1939, seeking a more concise name for the company, the Board of Directors decided upon Metrovicks, which became interchangeable with the official company name of Metropolitan-Vickers Electrical Co Ltd. Under Sir Felix Pole's chairmanship, Metropolitan-Vickers developed new products for the aviation industry and during the war was one of the sites where Lancaster bombers were built. In 1941, the company developed the first British axial-flow jet engine, the Metrovick F.2. Following the Second World War, the company appointed Oliver Lyttelton as chairman, with the aim of increasing the efficiency and productivity of AEI. Despite his success in achieving this aim, Lyttelton was unable to resolve the commercial rivalry between Metropolitan-Vickers Electrical Co Ltd and the British Thomson Houston Co Ltd. During his second period as chairman, from 1954-1963, Lyttelton, now Lord Chandos, oversaw the development by Metropolitan-Vickers Electrical Co Ltd of the first commercial transistor computer, the Metrovick 950. Chandos also resolved to extinguish the competition and internal divisions between Metropolitan-Vickers Electrical Co Ltd and the British Thomson Houston Co Ltd, and both company names ceased to be used from 1 January 1960, with all subsidiaries going on to trade under the name of Associated Electrical Industries Ltd.

The Edison and Swan United Electric Light Co Ltd registered on the 26th October 1883 as the result of a court settlement related to infringement of patent rights to the light bulb brought by Thomas Edison against Joseph Swan who had received an English Patent for the incandescent lamp in 1878. The company continued to be known by this name until the early 1900s when the name Edison Swan Electric Co became more commonly used. As well as manufacturing light bulbs the company also set up the first radio thermionic valve production facility at Ponders End in 1916. Ediswan became a trade mark because of the earlier court ruling. The company eventually became part of British Thomson-Houston Co. In the same year with the creation of Associated Electrical industries and as part of the rationalisation of the group of companies. Production of Cosmos light bulbs was transferred to Edison Swan Electric Co Ltd from Metropolitan-Vickers Electrical Co Ltd in 1928

The Institution of Mechanical Engineers (IMechE) was established in Birmingham in 1847 with the purpose of giving "an impulse to invention likely to be useful to the world". Its work over the years has included administration of professional membership, administration of exams and issue of qualifications, and supporting the recognition of mechanical engineering through the Engineering Heritage Awards. The Institution’s first meetings were held at the Queen’s Hotel in Birmingham, with larger Ordinary Meetings held at the Philosophical Institution’s lecture theatre, located on Cannon Street. Although the IMechE entered into a year-long lease for holding Council meetings in the Temple Buildings, more room was needed. The Secretary, William Prime Marshall, found premises that provided residential accommodation for himself, plus a meeting room, library and an additional room for the Institution’s use. The IMechE signed a three-year lease on 54 Newhall Street, Birmingham. The Institution held its first London meeting in 1851 at the Society of Arts’ Adelphi Rooms. The Newhall Street building remained the permanent base for the Institution for 14 years, with Ordinary Meetings being held at the Midland Institute. In 1871, the IMechE’s Council formed a committee to look into building an entirely new house, where all meetings could be held. The committee considered three potential sites in Birmingham, but finally recommended refurbishing the existing leased building in Newhall Street or constructing a new building on land at the corner with New Edmund Street. This work did not take place and, in 1877, the IMechE moved to London. In London, the Institution occupied rented premises at No 10 Victoria Chambers for 20 years. In 1895, the IMechE’s Council set up a House Committee to build new headquarters on land purchased by the Institution at Storey’s Gate, near St James’s Park. Disputes with neighbours meant that work on the building did not begin until 1897. Construction took two years and the building was officially opened on 16-17 May 1899. During the First World War, the Office of Works and the National Relief Fund took over the IMechE headquarters. The IMechE moved into 11 Great George Street as tenants of Armstrong, Whitworth & Company. At the start of the Second World War, the IMechE moved out of London to The Meadows at Bletchworth, Surrey. In July 1940, the military requisitioned The Meadows and the IMechE moved back to Storey's Gate in London. During the Second World War, the IMechE headquarters acted as a meeting place not just for the Institution, but for other bodies including the Royal Netherland Institution of Engineers, the Association of Polish Engineers in Great Britain and the Society of Engineers and Technicians of the Fighting French Forces. Government departments also made use of the building, and in January 1943, a group of senior REME (Royal Electrical and Mechanical Engineers) used the building to plan the mechanical engineering support for Operation Overlord and the invasion of Normandy. In 1975 a new office was opened in Bury St Edmonds, with the relocation of several departments. This office closed in 2004. The IMechE continues to represent professional engineers under its mission statement of "Improving the world through engineering".

Professional society founded as The Society of Telegraph Engineers in 1871. It was renamed the The Institution of Electrical Engineers (IET) in 1887. In 1924 the institution obtained from the Privy Council the right for corporate members to describe themselves as Chartered Electrical Engineers. It was registered as a charity in 1963, and joined with the Institution of Incorporated Engineers (IIE) in 2006 to form the Institution of Engineering and Technology (IET).