@Keith - not as far as I know, and they've had destroyers and the barque Sedov there in the past.
Only slightly OT, if you look at the lock to the marina you will see that the gates face in different directions. The inner gate is built to most strongly resist pressure from the basin whereas the outer gates (which are taller) most strongly resist the river. Normally the river is lower than the marina. Typically there is a short period at HW when there is "free flow" and both gates are open, but at HWS and if there is a surge, then the outer gates have to be closed as part of the flood defences. Ironically this is the only time that the lock is unusable, otherwise it is an all tides lock. Gillingham marina is similar, I've had to wait in mid-river before now for the level to drop so that they could open the outer gates.