we're never ever gonna get it just right for everyone, thre is always going to be distance problems. One of the reasons I couldn't do that last meet was distance and then obv money, cost of room etc.
Xellidh, of course scots are included, though not sure that makes conventry mid country. I've just googled a map of uk and from scottish border to southampton which is on the mid point of the southern coastline I make Nottingham the mid point, however, if we were to take scotland into the measurements then its approx Richmond, top of North Yorkshire. It really would come down to who put names down, and work out where they are all coming from.
Somewhere along M62 would be great cos its a straight line across the country. Hull to Liverpool....loads of potential.