Over all the years I have been studying the sediment sequence at Abermawr (on the North Pembrokeshire coast) I have never before seen so much of the storm beach stripped away. And it has been a big surprise.
I had assumed that the storm beach - which is quite spectacular -- was very thick indeed -- maybe 3m or 4m thick, and that it was resting on a deep notch cut into the underlying Devensian and Holocene sediments.
However, we can see in the above photo (showing the northern drift cliff) that there is no deep erosional notch, and that the pebbles rest on a steeply sloping surface of till and underlying periglacial slope deposits (the lower head). The volume of the pebble beach is maybe just 50% of what I had assumed.........
If we assume a similar situation for the middle part of the bay, this is realistic: