I've seen omega blocks before, but the MetO output tonight is rather odd...
http://217.160.75.104/pics/Rukm1441.gif
That looks like an upper omega block over the UK, I assume that'd keep the
cold over us for a while. However, just to the west looks for all the world
like a *surface* level omega block - two blocks, side by side...
I've not seen that before.