well I've heard that it's usually on the first day after Christmas day, but not sure this year as there was a leap year no too long ago and there's a full moon...
I think that I'd try boxing day, but can't for the life of me remember where I heard that, nor where I'd get such a ludicrous idea from?
anyway, i'll let you know when I find out for definite. Watch this space
Nicky
xx