Sorry, I should have said that this is white wine, from my greenhouse full of white grapes.
I did allow it to breathe for about half an hour but it made little difference, and it was brilliantly clear with no sediment so didn't need decanting.
I'll maybe try another bottle in September/October and again next summer, then if it still tastes the same I'll know what to do.
It's probably a good idea NOT to try and make wine this year anyway, with the distinct lack of sunshine the sugar levels will probably be rock bottom.