Yes its true . even I can't login using my UK based Ip. Had to use tor .
Seems it is indeed true.
I just read this on another thread https://bitcointalk.org/index.php?topic=308793.msg11628622#msg11628622
The UK Gambling Commission has written to online sportsbooks, bookmakers and casinos telling them to block anyone with a UK IP address.
Already, Direct Bet and the Fairlay Bitcoin betting exchange have implemented this today.
It's outrageous.
It does seem they have locked out UK customers primarily for this reason.
I can't however find any news about this online.