So we have switched to DST in most of the European countries. Originally I wanted to count down for 01:00:00 UTC when the time changed but ended up sleeping in my bed instead.
It was a few minutes after 1 o'clock, ie. actually after 2 o'clock, when my roommate came and looked at my alarm clock sitting on my bed, trying to figure out what time it was: which was not that easy, as my old alarm clock, which I bought on the continent years ago, for some reason sticks to the continental time and, having just synced, it read 03:08. My watch, on the contrary, had not synced and read 01:08. So I explained the time to my roommate, triggered manual reception on my watch once more and slept on, not being able to cope awake with the fact that my watch was not showing the correct time.
Eventually the reception at 3:05 was successful and when I woke up in the morning I saw the little DST indicator on and my watch showing the correct time again :)
Thinking of how the time changes on radio controlled clocks and watches: I've looked at the web page of NPL and in the document
it says: "When UK civil time is subject to one-hour positive offset during part of the year, this period is indicated by setting bit *58B to '1'. Bit *53B is set to '1' during the 61 consecutive minutes immediately before a change, the last being minute 59, when bit *58B changes."
Which leads me to the idea: if I had had my watch sync within an hour before the time change, would they have switched to the correct time exactly at the time change, or would there have been one more sync needed after the change?