Many, many thanks for your replies. What a lively forum!
The debris netting appears to be quite a good idea, looks really sturdy and would withstand moving around to various locations in the garden. A couple of questions...
1) Presumably it doesn't block out too much light? What colour do you use? I would like to also use it on strawberries, raspberries & other soft fruit to keep the birds off.
2) What method do you use to support it? Up to now I have supported the black, plastic netting with bent-over arcs of plastic electrical conduit, these have been ok but all a bit wobbly in windy weather (like now!). The debris netting would put up quite a bit of wind resistance I would imagine.
Any orders would be for delivery to a UK address - we would pick it up on our next visit to the family.