Skype is exactly the same as in the generic firmware - the only place I've heard of it being disabled is India. From looking at the global & UK firmware, there looks to be a number of config changes (things like internet radio stations - though I don't actually look to have the UK ones, so I'm not certain on this) and some extra scripts/config around WLAN. If I find time, I'll go through the diff and see what actual changes there are (there's a lot of gconf changes which come out just because the modified timestamp is different). A number of the changes look to be just cleanups/text clarifications which really ought to be in the global firmware anyway, so perhaps the UK team isn't actually speaking to the global team (which would explain a lot).