On Tue, 22 Dec 2015 11:55:10 +0000 (GMT), Dave Plowman (News) wrote:

The 1966 thing is what we need.

No we fing don't. That trial was awful from the POV of a six year
old, walking to school in the dark wearing the issued Hi-viz waist
coat.

The obvious snag is the time of daybreak changes dramatically across the
country. So what is fine in one part won't be in another.

Roughly 40 mins most westerly (Soay) to most easterly (Lowestoft)
points of the UK but with a 8:1 bias to early sunrise. So Soay has
sunrise approx 32 mins before Greenwich. Yes, I know it's not that
simple as the earth is a tilted spheroid so the terminator doesn't
follow the lines of longitude very well. I think that that affect may
have is to shorten the time difference between Soay and Greenwich in
the Winter.

--
Cheers
Dave.