In reply to Southern Man: How far south west?
South wales have an active winter league.. I don't know many of their races but winter races tend (not always by a long way) to be short and marked out..
Check the Mercia fell runners site for the borders..
On the fellrunner.org.uk site there is a website.. PM = partially marked.. NS = nav skills required..
ABC refer to ammount of climbing.. S M L = short medium long..
so AL long and lots of climbing.. CL is a much flatter faster race..
for example. BM PM would be a fairly undulating.. marked out route..