This LDWA event goes from Ben Rhydding this Saturday (10th Nov) with a start at 8.00. 21 miles, 2700ft of climb over Ilkley Moor and Windgate Nick. There's a longish canal section before a climb back over from Airedale to Wharfedale via the Twelve Apostles.
Although it's LDWA, there are normally plenty of runners.