If you know Mostyn port at all and your coming from Flint direction, before the port you pass a small pub on your left , just a bit further on your right there is a narrow straight track heading towards the sea passing over a small railway bridge. Go down the track , at the top turn left, park near to the end of this bit and fish off the rocks. Best to try low water as there are a lot of snags close in. use Crab and you may get a Plaice ! Use grip leads as the tide run can be quite fierce on the flood. Good luck.