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Apologies to any scientists watching my story on solar power on Royal Wedding Friday. As I'm sure you spotted the graphic reduced the SI Unit for kilowatt from kW to kw. Oh those lower case W! As I often say to put scientists at ease before I interview them "tv isn't a paper in Nature" and indeed it is a different beast but we do strive to get the details right while using the broad brush of television.

The reason for the mistake is that the graphic was put together while I was out filming another story and my handwriting just didn't make the difference between W and w clear enough. Lesson learnt! Sadly on the Friday itself there were so many Royal Wedding graphics to be sorted we just didn't have time to save this situation.

That said I must end this apology with a word of praise for our graphics team who work very creatively at very high speed. From odd town spellings, strange sport conventions and the pitfalls of SI units they manage to achieve the almost impossible every day. So thanks to them and next time I'll make my handwriting much clearer!