Re: So will UK viewers notice more of a difference with the Blurays...
The Blu-ray episodes will also probably seem slower to us as the conversion from NTSC 60fps to PAL 50fps sped the episodes up by 4.2%. The video quality of the DVDs looks just as soft to me as the original broadcasts (repeated most recently on Virgin 1, IIRC). I haven't seen the NTSC versions for comparison. I expect a notable improvement.
"Sans le canard de Vaucanson vous n'auriez rien qui fit ressouvenir de la gloire de la France." -- Voltaire -- Flip flap!