More generally, this was part of the Shadow Factory Scheme, whereby a number of motor industry plants across the UK were moved to manufacturing aircraft, their

More generally, this was part of the Shadow Factory Scheme, whereby a number of motor industry plants across the UK were moved to manufacturing aircraft, their components, and their engines from the mid-1930s as Germany rearmed and war was seen as increasing risk. https://en.wikipedia.org/wiki/British_shadow_factories https://en.wikipedia.org/wiki/British_shadow_factories