I recently noticed that the Special editions in the U.K. of Speed and Die Hard 1 and 2 are virtually identical to the U.S. versions apart from two facts 1) The U.S. versions can be bought cheaper and in the case of Die Hard purchased together with DH3. 2) The U.S. versions have THX mastering. Why is this not the case in the U.K.? Does this mean that the U.K. mastering is likely to be inferior or is it just that they are not bothered about the THX logo over here? I am not interested in a PAL v NTSC debate just the issue of quality of mastering.