After gaining my ADC/GMC endorsement at Glasgow (1972) I was sent to Sumburgh for H & I experience. The complement there, right at the start of the oil boom, was ATCO Manager, 1 x tels engineer (who was supposed to be a FISO too), clerical assistant, 'several' firemen/baggage handlers and one MT Mechanic. The ATCO was assisted by ATCO cadets rotating through every 2 weeks for 4 weeks at a time. The relief ATCO Manager , who was there when I arrived, was supplied by Aberdeen.
This was well before radar and ILS were installed , but there was a choice of NDB or VOR approaches, and on more than one occasion, we had more than one aircraft inbound for an iap.