A day when singlets were worn

comfortably. Outdoors! 

That's it. We are now officially in  a heat wave situation. 
Three days in a row. 

A pint of stale Guinness with a chewed straw in it at 8.30am outside the Citizens Advice Bureau (if that's the sort of advice they dispense, I wish I had known earlier... I shall be queuing there as soon as manage to extract myself for the Mistake Factory...) - this has to be the surest sign that we have been hit by a heat wave.

That and the smell of grilled meat emanating from prams.