Been out on my 20 foot Shetland for the last 4 days cruising between Sawley down to Farndon and back with my son.
In Hazelford lock on the way back upstream we got told off by the Vlockie for using a riser and a ladder, the guy said it wasn't safe. Its unbelievably difficult to hook on to a second riser from the cockpit of a very small cruiser in a river lock, in fact it is actually dangerous as the procedure involves either shunting the boat around or dangling over the transom with a boat hook after shes roped on at the bow.
After we left the lock my son commented that we should just move out of hours as generally it's less hassel when we operate the locks ourselves.
On a separate note there are sand bars outside Holme lock, Hazelford lock and Stoke lock I'm hopeful the Canal and River trust might do some dredging soon, you never know.