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Sainsburys_Ed-
Hard to say. The front on my commuter is still going strong after two years all year riding, mind you with a lots of cuts now but never punctured. Quick calc suggests thats approx 7000 miles.
Rear I have replaced once and probably around half way through it. So lets say 4000-5000 miles. Only flatted once too. Mind you, I don't skid and I only weigh 70kg.
Hovis
Your one looks like a cut from the road to me. Mine blew out whilst rolling away from some lights at very slow mph so not catastrophic thankfully. Like I said, I think mine was because I was a muppet with my tyre levers. I've used those levers for poking and scraping against things in the past so their tips are quite sharp now. I was an idiot to use them.
Gone through about 15 gp4000s tyres and never had a failure so I wouldn't jump to the conclusion that they are badly produced.