Start and end of the seasons is also affected by altitude and how far North or South one is.On that basis, mid summers day is the beginning of summer??, and midwinter's day is the beginning of winter??
Actually, the four seasons defined by meteorologists does fit in quite well, after all those seasons are primarily about weather anyway. Those seasons are centered on the solstices with a 1-2 week delay, which is appropriate in the UK to allow for weather change inertia.