Im thinking somewhere between Sunderland and Newcastle. I realise this might require some suspension of hostilities but its in the name of a good cause lol!
Also, this could extend west as far as Carlisle or north as far as Edinburgh, I thoroughly recommend the A69 if theres an open road and few caravans and trucks! Middle of the night is the best time to fast run that road but not very suitable for a sociable time to meet, plus you can turn off speed cam warnings once youre across the border to the south
Seriously though, whos up for a simple meet somewhere, if for no other reason than to compare cars and say hello.