Ours are eating grapes Colin ... no point in our making our own wine here
we're surrounded by it for hectares
In previous years we have started eating them by the beginning of August, so I am assuming our late starting warm weather has had an effect this year. By March we are usually over the worst and temperatures in the region of 23/24° but this year it was well into May before it started
The 'real' grape harvest usually tales place around the 25th September... but we have known it be as early as the 12th due to extremely persistent hot weather causing the sugar level to rise ...... I think it will be later rather than sooner this year !
Your unusually hot weather this year has obviously had a good effect ..... happy brewing !