Graham.
You dont give that much away. Your profile suggests you like to keep things close to chest.
Seriously I am pleased to hear I am not the only errrm, mature angler on this forum. Although I am only 37.
My 'Aquashed' has only had to have one zip replaced in all the time I have had it.
Never leaked once. Just a little condensation now and again, and I still use it at 3 Lakes. Everyone who walks by it thinks 'what the hell is that!'
Who is Dave Barnes Graham?
Pity he does not know how much I love this Bivvy. 
Regards Axeman.