I am interested in making country wines. I had a go at plum (only a
gallon) but it proved rather insipid. It tastes like wine, but not any
particular type of wine!

The problem is that it is very hard to get good fruit in the UK.

I would like to try to make a strawberry or raspberry wine and have
heard that frozen berries are very good for this sort of thing. However,
I can't find them anywhere and Google only comes up with wholesalers.

Does anyone know where I might look for frozen fruits in the London area?

Thanks in advance.