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From the M40
Junction 1 (A40/A412/A4020) (Denham Roundabout)- Leave Motorway (signposted Heathrow) and at traffic signals turn right then follow signs to Uxbridge to join the A4020. Follow for 1.2km until you reach the junction with the B467  at the Roundabout take the 3rd exit. Follow for 200mtrs until you reach the Uxbridge Gyratory. Take 2nd Main exit A408 (Signposted Yiewsley, Heathrow Airport). Follow for 800mtrs until you reach traffic signals at the junction with Cowley Mill Road (Hale Hamilton Valves on opposite right hand corner). Turn right into Cowley Mill Road and follow for 400mtrs until you reach traffic signals (in front of hump back bridge). Over the bridge take a sharp left into Wallingford Road Quelch is 150mtrs on left hand side.
From Heathrow / M4  
Concorde Roundabout (Heathrow)
Follow signs Central London M4 Junction 4 (A408) At roundabout take 2nd exit (signposted Uxbridge) At traffic signals go straight ahead staying on the A408 (signposted Uxbridge, Stockley Park). At Stilwell Roundabout take the 1st exit, follow for 300mtrs to Colham Roundabout. Take 1st exit then follow for a further 250mtrs to Apple Tree Roundabout and take the 2nd exit. Follow the A408 for 1.6km to Yiewsley. At traffic signals turn right onto the A408 (signposted Uxbridge) and Follow for 1.6km towards Cowley. At traffic signals go straight ahead staying on the A408 follow for 300mtrs and at the mini Roundabout go straight. Follow A408 for a further 600mtrs to a set of traffic signals (Junction with Cowley Mill Road) Hale Hamilton Valves immediately on the left hand side. Turn left into Cowley Mill Road  and follow for 400mtrs until you reach traffic signals (in front of hump back bridge). Over the bridge take a sharp left into Wallingford Road Quelch is 150mtrs on left hand side.