The most annoying aspect of Sunshine not getting a UK day and date Blu Ray release is that a Blu Ray release is getting day and date in Japan next week so it is certainly ready!
This is the biggest problem IMO with the HD release schedule, too many releases of older films (the fugitive anyone? great movie but not an essential HD purchase I think) at the expense of new movies being delayed on BluRay, as Ramalho says, I aint buying it twice.
Movie companies treat you like a cash cow with an unlimited supply of funds and then they wonder why people turn to BitTorrent! (not supporting piracy, just making a point about why some people turn to it).