Unless the unknown traffic is believed to be lost, has experienced radio failure or believed to have infringed controlled airspace then no action is taken as it is deemed to be outside controlled airpace and as such no separation is required or traffic information to be passed.
Personally I would advise pilots of IFR traffic that the contact is there but believed to be outside controlled airpace.
MATS pt 1 section 1 chapter 5 page 13 14.2 refers
Last edited by radar707; 10th Mar 2007 at 09:33.