The Grapes of Louth

Forgive the pun - couldn't resist it! Fiona is responsible.
Cynthia authoritatively states that the most northerly vineyard in England is in Lincoln.
That may be so, but here in Louth my sister has grapes ripening out of doors. This is north of Lincoln, at a distance of some 210 kilometres north of London.
Quite remarkable, and if that is not conclusive evidence of climate change I don't know what is.