I fly in the Vale Of York AIAA quite often, so i try and fly between FL70 and FL110 and days that permit.
Especially when flying over the humber bridge, I have been over there on days and seen over 200 gliders circling below, the ATC controller gave up giving me traffic alerts and just said Good Luck!! Climb as high as possible, lol!!
Best feeling in a light aircraft when peaking over FL100, amazing!!