I think people have misunderstood me - I know perfectly well how to sign off on correspondence, I just hadnt come across "Best" until recently and wondered what the deal was.
I have not seen just "Best" - usually All the best.
It seems that when people see something new in emails, they copy it. It would be interesting to see if we come up with a new ending and send that to a few people - how soon we might see it again
I'm with Chase. I tend to use Kind regards, unless it's more informal then I use Cheers. I have to say, I haven't really come across "best". Frankly, it seems a bit meaningless, unless you're George Best