In reply to Sebastian Fontleroy:
Saw a huge halo round the moon last night, as I walked back from my sister's house to my mum's house, probably about 10pm
I've also noted that there was one bright "star" quite close to the moon
And that, and your post, made me realise that I haven't got Stellarium installed on my current laptop
http://www.stellarium.org/
Just installing that now...