Reigning National Trophy champion and 2012 title hopeful Paul Oldham (Hope Factory Racing) suffered a scare on Sunday when he dislocated his shoulder in the North West League event at Maccdlesfield and was forced to pull out.
The Lancashire-based rider fell on a corner and landed heavily on his elbow, forcing his shoulder to dislocate.
Although he managed to relocate the limb and tried to continue, he pulled out shortly afterwards, perhaps with one eye on next weekend's final round of the National Trophy and the National Championship a week later.
"It's not that bad now," he said a few hours after the race at South Park. "I've done it before and it's an ongoing problem for me. It will mean I can't ride my bike much this week.
"Usually it comes out in my sleep but this time it's been forced out by the fall.I managed to roll around and get it back in, but I couldn't manage the handlebars so pulled out."
Another non-finisher at Macclesfield was North West League leader Giles Drake (Team Elite), which meant that David Fletcher (Orange Monkey-Cannondale) secured victory - his second of the weekend following a win in Saturday's Notts and Derby League race at the Thornbridge Centre in Derbyshire.
Fletcher beat Nick Craig (Scott UK) and Jack Humphreys (Wheelbase) at Macclesfield, while on Saturday he again beat Nick Craig into second spot, with Tom Payton (Isla Bikes) third.
Elsewhere, Three Peaks champion Rob Jebb (Hope Factory Racing) took a convincing victory in the final round of the Yorkshire Points Series at Todmorden on Sunday.
He crossed the line more than two minutes clear of his nearest rival after making maximum use of his running ability on a very muddy course.
And in Norfolk, veteran Greg Simcock proved fastest in the Eastern League event at Snetterton, where he won by just 16 seconds from junior talent Sean Dunlea (Ciclos Uno).
And in road racing, Metaltek-Scott professional Tony Gibb secured a fourth victory in five races in the Imperial Winter Series at the Hillingdon circuit in London on Saturday.
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