Hello I live in Shoreham and have done a limited amount of spinning on the beaches between Brighton and here with reasonable success; mackerel, gars and the odd school bass. Conditions I've found that bring the fish in are the usual sunshine, flooding tide. My top lure is the old faithful 28g Dexter.
Mullet are a favourite target of mine, however I've only caught them on float fished bread. I've just bought some samll spinning rigs with tiny hooks from the Brighton angler, the fellers in the shop tell me these baited with bits of rag worm catch well in the rivers and estuaries. We'll see.