Buzzer:
Definitely in the past just look at the motor going the other way is that an FG ? Buzzer.
And a Cawthorn and Sinclair Artic from Birtley - looks like a Merc. Big company at one time,did a lot of work for Caterpillar,I remember their yard well as it was next door to Durham Chemicals where I tipped Xylene regularly int 70s.