Found it!

This is Sunnyside beach - we’ve had 2 attempts to reach it; from the Cullen side we got a fair way but climbed a very steep cliff until I got the collie wobbles as we had to turn back; this was trying to go in from Findlater Castle end. We got so close but again it was fairly steep but going downwards and very slippery so we were sensible and turned back - one day we will get there