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...stic Grasstrack season is the British Masters Championships. This official ACU championship is where the British champion is crowned in the mainstream 500 ...itish motorcycle sport, the '''[[AutoCycle Union|Auto Cycle Union]]''' ('''ACU''') who organise an annual British championship.

* [http://www.acu.org.uk/ AutoCycle Union] - [[AutoCycle Union|ACU]], The UK Governing body

...e)|Norton]] star [[Geoff Duke]] a strong challenge in an [[AutoCycle Union|ACU]] race at the [[Thruxton Circuit]].