Is that the same North Weald the Govt wants to obliterate under a massive housing scheme?
Airfield Ops covers amultitude of sins. I suspect the new boy (girl) gets to cut the grass!
If it were me I'd phone them up and ask if they could list out the equipment so you can check them against your skill sets.
Patrol could be Bird Control, Perimeter Security, Airside Safety (ensuring everyone looks suitably Canary Yellow) Follow me services for lost taxy-ers. FOD suppression and fetching the ATCO's their butties at lunch time
Just a guess!
Sir George Cayley