The Banbury Tri bike route is as follows:
Please note: all distances are approximate.
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Leave Woodgreen Leisure Centre and turn left at the roundabout – on to Woodgreen Avenue
At 0.5km the next roundabout turn right onto Broughton Road (B4035)
At 6km miles turn left on to – the hill climbing up past Tadmarton Heath Golf Club
At 9km miles, you reach ‘Wiggington crossroads’; turn left at the cross roads – towards Milcombe – you go
past the Rye Hill Golf Club and down the hill
At 11.5km bear left into Milcombe village – follow through the village
At 13km turn left towards Bloxham (A361)
At 13.5km turn left (before the Bloxham mini roundabouts) in to Cumberford Hill
At 14.5km turn right in to Courtington Lane
At 15km turn left towards Banbury (A361)
At 19km turn left on Queensway
At 19.5km go straight over the roundabout on Woodgreen Avenue
At 20km turn right at the roundabout back into the Woodgreen Leisure Centre.
Finished! 
A picture map of it too: