Not only Sopwith: Avro to Crossley, Airco to BSA, and widely in non-aero. In 1919 the issue of "merchants of death", the reward contrast between those that had made and those that had used munitions, caused a political need for a windfall tax. Overnight restructuring was a response, like a Small Works Builder liquidating to frustrate creditors. The lesson was learned by Treasury and for the Second time around UK had (from March,1939, Armament Profits Duty, then for any business, not just Munitions) Excess Profits Tax, designed to hold firms' profit-on-capital employed at some semblance of pre-War norm. From Sept.1941 it confiscated 80% of the excess of 7.5% on shareholders’ funds. Firms still folded (Cierva, Cunliffe-Owen, General, Miles, Parnall), unable to carve out civil work, but did not restructure to shelter past profits.