Does anyone know if this is BD region free? (I have US region BD's which I currently play on a region free PS3).
No, it won't be BD region free. You can make it region free for DVDs, but for BDs it will need a hardware modification (the cost of such modification, if you find someone who could do it, will be around the cost of your player). It'll be cheaper for you to replace your US region BDs with UK ones.