Everyone talks about the M4 being a dividing line, but I live north of the M4 and south of the M40 and in my experience it's always the M40 marks the border. The stokenchurch cutting through the Chilterns in particular. You can guarantee storms will not come south of the corridor, nor snow. It's like there's a forcefield on the Bucks/Oxon border. Of course, if I'm proved wrong and I do get some snow I shall spam the thread with pictures!