Hey Jono,
had the same issue with a Jaime Pro 2010 - took it back and it was replaced - took a while though and I had to keep chasing it up.

I took my board to the shop, they took pics and emailed to North - let me keep the board until the replacement came in - so I got to use it.
The bubble didn't get any bigger but it didn't go away either.
New board's all good