When I used to do business there I wore a Timex digital, because that's what I had. Now I have a few watches, all affordable enough to wear for travel. None of the GMTs appeal to me - I think I can handle a 5 hour difference in my head. Of all of my watches this Casio Pro Trek radio solar is the easiest to change to London time and back (around 5:30 in the video). Also the battery won't run out! I'll bring a Timex Expedition digital beater with Time2 set to London as a backup.