We were once pushed from one side of Hythe to the other, heading in, fenders on starboard side and tight to the lock wall, but long lines as the lock water level was much lower than the marina.
When they opened the sluices we were pushed laterally across to bump against the opposite side, with no fenders out.
I think they opened them too quickly, but we were just not ready and didn't react quickly enough, as usual when the unexpected happens everyone panics.
Next time I would have someone on each line to draw them in as the level rose and keep the boat tight to the wall, and try and moor further back, we were right up the front even though we were the only boat in the lock. And perhaps have a roving fender that could be deployed as necessary.
Having said that, the last time everything went perfectly with no bumps and scrapes anywhere. But the change in water level was very small so the sluice current was minimal.
Larson 240 Cabrio "JORIDA", Saxon Wharf.