Thanks to Robin Mawer for posting the shots on Stop Press because earlier shots have now been removed. Could be good to post some more shots on the forum if photographers don't want to post on galleries.
Uniform upperparts (perhaps not right tone for Brown?), primary projection not a pro for Brown but doesn't rule it out? Appears to have pale lores which is more pro for Red-backed. Looks a bit Red-backedish in these two photos but maybe not as simple as we'd like and shouldn't throw the baby out with the bath water?
1st-winter Brown Shrike, Bryher, Scilly, 24th Sept' 2001 © Marcus Lawson
Brown Shrike?, Isles of Scilly, St. Mary's 27.10.08, Robin Mawer
Nice ID article
Red-backed Shrike in Korea
Links to more photos of Scilly bird by Marcus Lawson and some ID notes by birding luminaries