Found what looks like a weird "glitch" with the clock and DAB Radio.
Firstly, if you set the time source to GPS, there's an option for "manual daylight savings time". If you leave this unchecked then the time shows as GMT, not BST and is thus currently an hour behind. If you tick the option then it correctly adds an hour - ok fine.
But then, if you have the DAB Radio display set to show additional info, then it shows the current and following programmes together with their start times, except these times are an hour behind - they're effectively showing the GMT time, not BST.
Bit weird but then, as of 2am tomorrow morning, this won't be an issue as we'll be back on GMT again