I saw several 206 & 206L either arrive with popouts blown, or blow them on the ground.
Ah well .. pilots and finger trouble TRC!
'Twas mentioned afore that Air Gregory were providing H300 support to the Met prior to Twyfords:
Air Gregorious Hughes 300 G-AZEJ on contract to MetPol in 1972 (although seen here in a TV role)
AZEJ (a 269C) was registered to 'Medminster' of Richmond in London from 1971 to 1976 whereafter she was bought by Autair who sold her to South Africa in 1980.