The Yorkshire Trench can be found around the back of an Industrial Estate near to Essex Farm. Follow the main road away from Ypres, past Essex Farm and the canal will be on your right. The other side of the canal you will see the industrial estate - follow the road until the junction and a bridge crossing the canal on the right, follow for 100 yds then bear right again into the industrial estate.I think it is the 4th turning left! will confirm one day!!