Apostrophes

Not meaning to be a captious pendant, or to blog about grammar, but...
There's a sign outside the pub, up the road from where I work, which says: "C'MON ENGLAND".
I say this, and did a double take. What does this mean? Surely it couldn't mean "Come on England!" (for the Football World Cup that's apparently going on), as that would be abbreviated "C'M' ON ENGLAND", or perhaps "COM' ON ENGLAND!".
The only thing that I could think it could mean is "Common England", which doesn't make any sense...although, the pub is The Three Legs, which has a bad reputation, so I wouldn't put it past them.