The equipment under discussion, which is used by Aerodrome Controllers in VCRs, is called an Aerodrome Traffic Monitor (ATM).
Peter wrote:
However you would also need radar qualified ATCOs which is another salary increment.
Here is the first paragraph in MATS Part 1 about the ATM, with my bold text:
17 Aerodrome Traffic Monitor (ATM)
17.1 An ATM is provided at certain aerodromes to assist in achieving maximum runway utilisation and aerodrome capacity. Operation of an ATM is not associated with a particular rating and must not be used as an ATS surveillance system to provide Approach Radar Services.
A google search for CAP 493 will find you the whole document. The relevant section is Section 17 of Chapter 1.