Gooseberry plant has gone blind

[Primrose]

Can anybody suggest what is wrong with my 4 year old red gooseberry bush. Last year it had only a few small fruits which mostly withered before they could be picked. This year it has no fruit at all although the leaves look very healthy. It has been well manured and is in a border where on the other side of the fence our next door neighbour has some rather strong growing shrubs and I'm wondering whether their roots are taking all the nourishment away, However, two other gooseberry bushes in the same environment and are fruiting healthily.