I would guess that EZY will not accapt a Radar Information Service where there is an alternative service available. However, if there isn't, they would take the RIS that is on offer. When they flew NEW-CPH they headed east out of Newcastle and mixed it with the fighters under a RIS from ScACC until they entered the upper air. (Where they mixed it with the fighters under radar control
)
Can't see the Londonderry-Belfast routing being a great problem to them.