Some years back, a pilot in a passenger carrying 737 received a Radar Advisory Service (at his own request) from me at a unit using raw radar AR1 equipment.
After a couple of "Avoiding action, turn right heading 120, traffic was 12 O'clock, range 5 miles, height unknown" type transmissions to cater for unknown "pop-ups", he asked me if I had any idea what this was costing his company in fuel.
When I replied that I didn't, I also asked him to confirm what service he was requesting. He confirmed RAS, so I continued with more of the same. In return, he complained again and eventually requested a Radar Information Service. Some days, a controller can't win.
