The first lock we ever negotiated ourselves was brownhill on the gt.ouse and the lockie at hermitage has warned us it was running a bit fast, confused by how a lock can run fast we found out when it was well over both gates, if it wasn't for wire fences we could have just gone around it.
Yes erith was about a mile wide with picnic benches poking out of the water, Easter 2001 I think it was.