Hi,
I thought I'd update this thread with my findings while on holiday so it's more useful for anyone else in my position in the future.
We visited Caerfai Beach Crag after borrowing a Pembrokeshire guidebook and looked up Caerfai Bay. Also, be aware that the crag is only accessible from the beach at low tide and you don't have long before it gets cut off.
Please find the attached images to help anyone in the future.
Thanks
Adam