I would assume that at this moment, they are ok for pie-making (I know they are sour, but you add sugar) I always remember my mum buying gooseberries when I was little, and they were always green. Then later on, say July/August, they are ok for eating sraight off the bush
I am not that much far south of you, Birmingham in fact and I have a couple of Gosseberry plants to put in my allotment this year. They are in pots at the moment but what should I do to a clay soil to make it habitable for the gooseberries. Any advice for a newcomer and new gardener please.