UB had factories all over the UK, hence the liberal disbursement of biscuits, crisps & associated grub at every nearby regional airport and military in the UK & Europe come Christmas time.
I belive that Dave Ward was in charge of selecting the aircraft and Bob Turbin was I/C knobs, tits and shiney gadgets - hence the UHF, the BE350 was better equipped than most airliners during it's reign.