Thanks to Baker1000 for the following.
Amazon.co.uk now have the Lost: Complete Collection Premium Boxset for pre-order. It's pretty much the same set as the US version, it's out October 11th and it's slightly cheaper than the set without the extras on both formats. A couple of things to note though - no blacklight can be seen in the picture. Whether it's included or not is unknown. The packaging is different, so you can't see the Island map there. Again, it's unknown if this is going to be included.
DVD - £113.29
Blu-Ray - 142.49