Thanks Paul & JJJ,
so it's all down to a bit of dust. No wonder swmbo is always scraping it off the tele if that's what a build up does for you
But equally, shouldn't the same dust clouds stop us seeing in other directions too? Or is it that there's a particularly dense dust cloud blocking off our view of the centre, and not much blocking the other views? Is that how it works?
Thanks again for your replies guys, I'd really like to get this sorted in my mind.
Cheers
