Assuming it deflects sunlight mate. Not heard them cracking. Cam you replace the screen to the clocks? Mines cracked from a somewhat more painful incident lol
Apparently, it can happen with clear screens, according to some owners...mine got very hot last year. i got it to reduce glare though.....
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I was in Spain in 35+ degree heat in Sept 2011 for 6 days without a prob, can't see this being a prob in the UK
Most screens come with a sun shield built in mate, it the black strip or lettering on them like the oe screens...some after markets don't.