Of course its melting , thats what happens when the temp goes up. I think you should all cancel and book somewhere with snow. I hear Milton Keynes has a good slope.
honsestly, don't worry about it. 2 years ago we were there for christmas and the snow was good for so early in the season and i remember they only got the first dunp of snow at the end of november. Just think the first dumps have arrived earlier, the temps are lower this year and will stay down.