I remember Adams very well,but I never saw - or noticed - a twin headlight MK5 Mandator of theirs.I do know that they never stopped,trunking to North London day and night.The AEC MK5 Mandator would have been a premium motor in those days especially with the 11 litre engine with the 6-speed box and CAV Rotary fuel pump,I know from experience. 
Great stuff Top Cat,any more photos?