Spot on, that is one of it's specific basic purposes:
Uses of the Aerodrome Traffic Monitor
(a) Determine the landing order, spacing and distance from touchdown of arriving aircraft;
(b) Assist in applying longitudinal separation for departing aircraft;
(c) Enable the controller to confirm that the initial track of a departing aircraft conforms with the clearance issued;
(d) Provide information to aircraft on the position of other aircraft in the circuit or carrying out an instrument approach.
There are further uses that can be made of the ATM, like passing traffic information and establishing separation in a missed approach, but these require a dispensation from the CAA and are subject to further controller training.