Must let you know about this one LDWA - starts from Grassington (Yorkshire Dales), down over moors to Barden and then up the river and back - just under 25miles. Fanstatic last year, was minus 13 on my way there (7am) and about minus 4 when we set off. Light sprinkling of snow adn the boggy bit over the moors was firm (dry feet, now thats a one off!!!), it just give a little on every step - perfect. Details on the LDWA web site - lets have a few more runners (about 40 last year)