summer pruning gooseberries?

BBC web site says that sort of pruning is done in winter, look

here

You got it right. Young bushes can produce a great deal of growth in early Summer which is best reduced a little so that more air and sun gets in to help the fruit and wood  to ripen.

Leave any branches you want to make leaders to get the bush bigger. Cut some of the new growth back to about 4 inches, especially in the centre of the plant.  Now is a good time.

Main pruning is in the Winter when leaders are tipped by about a quarter and all side shoots are cut back to 2 buds. In young bushes there will probably be several branches that are growing in the wrong place. Be ruthless and remove them. Keep in mind that your aim in an open bush with a wine glass shape.