I have always comunicated with the nearest for a FIS or in the case of an A/G "Flight infomation" without the service. I would feel a bit exposed not in touch with anyone.
FIS with Leuchars last week "G-XXXX be advised, low level traffic approaching your area" I was at 1100ft QNH over 400ft terrain on the way home, very nice view of a Tornado, dead centre 6 o'clock to 12 o'clock 300ft below.