Observer: Summer officially ends today, with the Met Office confirming it as one of the wettest and least sunny of any on record. With the September equinox tomorrow heralding the start of autumn, figures show an average of 327.3mm (nearly 13in) of rain fell in the UK between 1 June and 31 August, and this month is also proving to be one of the worst. With floods causing six deaths and tens of millions of pounds of damage, forecasters say an average rainfall of 81.6mm was recorded by 15 …