Originally Posted by
chevvron
Simple. If your unknown confliction is showing a '7000' squawk (indicating a/c not receiving radar service) and no altitude readout you vector your own traffic at least 5nm away from it to allow for an unpredictable turn by the unknown.
If it's showing an altitude readout then irrespective of what is set on the aircraft's altimeter which will always transmit an altitude based on 1013.2 hPa, if the altitude indicated on the radar display (which will have the current QNH dialled in to enable it to convert from 1013.2) is showing 3,000ft above or below your traffic then traffic information is sufficient; if it's less than 3,000ft then the above applies.
I've never worked in Class E airspace, only Class G but I would imagine you would take the above action in airspace of either classification.
This would be the case if the aircraft was under a deconfliction service, in the Bournemouth case the Falcon was receiving a traffic service and self positioning for the approach. The ATCO fulfilled their responsibility by passing traffic information and updating it as required. If the crew want deconfliction advice it is upto them to ask for it.