OK, so I am an idiot, and maybe the horror will subside in time, but I fear I have just ruined my pride and joy.
I want to write and tell you guys, so the same fate doesn't befall you.
I did the damage by changing the UPS box in our office.
Now I hate to think what kind of magnets they carry in those things, but it seems my watch didn't like it at all. If I'm honest, I just thought the weight of the box was the battery, but I didn't even stop to consider that you need to convert from AC to DC and back.
Anyway, the long and the short of it is that, in the 24 hours since I changed the box, my watch has gained... 3 hours.
So yeah guys, please look out; I wouldn't want any of you to feel how I do right now. It's been a while since I've been on the forum, but I always found it a great place, and felt the need to do my civic duty and warn you.
And seeing as it is the done thing round these parts, I should inform you that my watch is (was?) an Epos Skeleton 3336.
Oh, and if anybody knows if/how this can be fixed, I would love you forever.