Interestingly, the 24 hr policy mentions that, in the not too distant future, a trial race may be used as part of the selection procedure ... hmmmm.
I've put a link to that on this page along with the selection policies of USA and Ireland for comparison. Those for Canada and Australia haven't been announced yet but I'll link to them in due course.
Also added a wee bit to this page.
Just found a rather good satellite photograph of UK taken yesterday morning. Notice how everything is white ... deep snow over the whole country.