A post script to my last post:
I have been proved right in my thinking about bird tactics. This morning, much to his annoyance, hubby found two chubby blackbirds under the net yomping on the gooseberries. One slipped out of the ‘protective’ netting as he approached, the other bird, in a bit of a flap, hit the inside of the net twice. As hubby went to help it out, it managed to squeeze through. There is now a search underway for finer netting. Some fine mesh fishing net would probably do, in the absence of anything else.