As Adam has said Lymington is great for launching at all state of the tide, but I think there is a slight drop from concrete to gravel, nothing major only a couple of inches.
It is also great from one man launch at top and bottom qtr of tide (if that's the right term) at high water use the wall on the lefthand side, launch and tie or tie and retrieve it using the wall. At low water, use the pontoon, I drop off at the pontoon, get my car and trailer, get and walk the boat over to the slip, it's only about 2-3' of water slip side of the pontoon.