hi dock dropper,
Sounds like good fun down the breakwater pier, there's a similar place on the Penarth side of the Cardiff Bay Barrage.
Walk past the old Custom House towards Dock Beach, then walk across the boulders a fish of the right side. Your not allowed to fish in the Barrage lock, but could give it a go in the night.
Had plenty of whiting, pout, eels, flounder & conger, even chance of a decent Bass!
May give the breakwater a go, is it down by the Yacht Club by Whit bay?
JD