How do Andy. Might just be bad luck mate.
If it makes you feel any better, about two years ago I had three punctures (two screws and one sidewall hole) in my rear tyres. The sidewall hole left me at the mercy of the only tyre shop in the area with a replacement tyre in stock. I duly bent over and they swiftly relieved me of £250 for a really crap budget tyre. Since then, no tyre problems at all - things happen in threes, see. Here's to no more puncturescherrsagai.