If you're flying over the N of IOM above 3000ft, give Ronaldsway a call on 120.850 (below that we have R/T coverage problems) you might even get a Traffic Service if you ask! Before that Warton Radar is probably a good bet on 129.525. If it's a weekday don't forget the Eskmeals danger areas D406 B & C often active up to 50,000ft, any local area ATC unit can give you activity status.