[alancalverd]

metal bashers in the Midlands

How very 1960s! The Blessed Saint Margaret Thatcher deemed that Britain should become a service economy because her husband was an accountant, not an engineer. Rolls Royce and Mini are now subsidiaries of BMW, Jaguar is Indian, and practically every other British car manufacturer mysteriously became bankrupt after attracting massive re-flotation investment and cleaning out the pension fund.

There are still a few factories in Birmingham making sewing needles and belt buckles, and Coventry airport is planned to be the next entrepreneurial disaster, to replace the runway with a speculative megafactory to make Japanese-designed batteries for foreign-manufactured cars. Metalbashing on any significant scale is  now done in China, not the Midlands, because it is all about profitability.

[Rodneyhhernandez]

General answer, smallest and most effective electric motor