Hmm. I didn't use to entirely trust my MSF-synchronised alarm clock to correctly track the BST change, especially since it usually only fires up its radio once a day, at midnight. Nonetheless, it's got it right every time so far, and even woke me up at the right time on Sunday, which makes it cleverer than damerell.
I only score two DNS - alarm clock so far. But bloody Stevenage is my nemesis, it seems.