Doomsday which was not too bad. It's entertaining enough, but nowhere near as good as The Decent or Dog Soldiers, which, as it happens, are two of my favourite horror/thriller movies. Marshall is a talented enough guy so Doomsday ends up being entertaining, without being brilliant.
Outpost is pretty decent too, I though. I like Ray Stevenson is pretty much everything, which makes anything I say bias, but nevertheless I did think it was a good movie. It was filmed near where my parents live, so it was pretty cool to see that terrain in a motion picture. It's very low budget, but a good movie, a nice example of British horror. It was released straight to DVD in the States by Sony, so it's worth checking out.