Yeovilton and Waddington. A real pain at any level above FL60 as you constantly cross with transmissions at the other end of the country. As they're both LARS units able to work up to FL95 it's about time one of these was changed
(FL65 the other day abeam Yeovilton - with the high pressure I was able to hear an aircraft climbing out of Gamston - weird!

)