[Watch face] Dual Time watch face

My requirements were simple.. The phone sets the time automatically when I land, so should the watch.  when away from my home timezone it should display my home timezone as the dual time.

So here's my effort..

First when I'm at home... and this when I travel..

I used the excellent httpebble IOS app to provide the timezone information allowing me to make my calculations.. I however did need to modify the IOS app as I needed the short time zone data rather than the long form.