Perth is in Scotland, so I’m guessing it’s first because of a probable political need to placate the noxious Scottish nationalists re: Brexit? I can’t think of any other reason why it might be top.

Updated, October 2017:

We’ve done well to move from 10-1 to 3-1.

Updated: December 2017:

The last Ladbrokes snapshot from the Google cache. Stoke seems to have been knocked out of the top three, by the bookies…