Oh great and wise HDI Gurus...

[Mattinthehat]

I say again - an air leak on this system is impossible. As I said above, the only way to get air into the system while running is if you run it low enough on fuel that the lift pump sucks it in. Even if what you're saying wasn't impossible, the system is self-bleeding anyway, so you can forget about airlocks and similar bs. Incidentally, anyone suggesting an air leak doesn't know what they're talking about so treat other advice from them with caution.

Before you spend any money on parts put £30 in the car then go and try to force it to cut out - best way is foot-to-the-floor acceleration from about 1500rpm in 4th all the way through the range. If you can't make it cut out you've found the issue, but if it still does it then we can start making some progress on the diagnosis. Always worth checking the obvious things first.

Also, for future reference, running the car low on fuel isn't a problem in itself, but it can cause the in-tank filter to clog with the crap that has accumulated in the tank over the years. Running it out of fuel to the point where it cuts out is bad for the pump though.

That was the Peugeot dealership head mechanic that said that about the air leak lol!

Well i have half a tank of juice and it still cut out when i floored it I can keep trying it if that will help force it out..??? i was low on fuel and going up hill when it first happened, but it has happened before a couple of times and i thought i had just stalled it by bringing my clutch up to fast now its a pig to start so i think there is something defo more than air in the system...