Re: GPS week rollover
I was going to suggest a radio-controlled clock, one that uses the NPL time signal (other time signals are available overseas, I believe), but then I bought one, and it annoyingly used to re-set itself several times a week to an incorrect time, often 15 or 45 minutes wrong. One friend of mine was invigilating an exam when their timing clock re-set itself, causing some consternation amongst the staff and students.
I am tempted to buy a new mechanical wristwatch, but that's probably because I am easily swayed by promotional advertising and shiny sparkly things.