Sun 25 Jun 17 Lock 18, near the Dirty Duck Pub, Duck Lane, Woolsthorpe by Belvoir NG32 1NY Boat trips on the Grantham Canal; Depart from Lock 18, Woolsthorpe Top Lock; Park in the Dirty Duck car park - just through the gate on your left - walk over the canal bridge and through the kissing gate on your right - Lock 18 is a five minute walk on the surfaced towpath...