I know the the bay well macattack101 and have moored my fibre glass boat there many times.
However I use a mooring screw and put it in place at low tide. (see attached photo) A good length of heavy chain and rope to a buoy and you have your own mooring for your holiday.
Never had a problem with it dragging and in my opinion ..safer than an anchor on sand. I take a 4 ft crowbar to get the leverage required to screw it into that beach as there seems to be good solid shingle under the sand.
perhaps of use to you too ?
I notice Lady Linda is still moored there too (the boat on the left of your photo) She must have stood many a storm there. Enjoy the area..i love it there..and I hope the weather settles. Im thinking of heading back that way next weekend