Entwhistle Reservoir. Just off the A666 north of Bolton. There are two car-parks near the reservoir. Take the Turton turning off the A666 onto Green Arm Road and follow the road until the sign for Batridge Barn car-park on the left. Take that road down to the water (across cattle grids). There is a small lay-by on the access road, don't use that, but keep heading down to the picnic-tables. Good dogging action to be had here. (lookout for the champagne astra)