Recently treated myself to all 5 seasons on DVD from the WH Smith sale. Puzzled by one thing; Seasons 1 & 2 are in full frame 1.33:1 ratio. Then in season 3 we are in glorious widescreen. However Season 4 we're back to boring old full-frame (but anamorphic widescreen menus) . But hang on Season 5 - back to widescreen. Can anyone enlighten me - or is this just another Fox DVD **** up?