They can fish at either state of the tide. I prefer to fish the south and middle part of the beach over low water, looking for gullies where the sandbanks are. If you fish it at high water, head up further to the ranch or the concrete pipe by the chip shop car park.
I’ve not see the sea today but looking at the wind, I guess the sea will be too rough for most of the beach. Sometimes the top north end gets enough shelter from the pier to make it fishable but why bother when you can go to Whitley instead.