If the infringer is a mircrolight, can a jet fighter fly at 30 knots to "chase" it? C'mon.......
I was under the impression that if an intercept is deemed necessary then usually its done by a police helicopter?
In the cases I've seen/heard about, the aircraft is tracked on radar then when landing, the airfield is called and registration/owner/pilot details are taken and usually dealt with by a bollocking. If it has caused a delay to departures or arrivals at an international airport and/or the helicopter was sent out then the punishment to PPL's is often an official caution by the CAA with some advisory/mandatory training required.