Andy, if you have mullet nearby you must have a go for themThey are without doubt the most sporting of our fish and on the correct tackle are superb fighters without equal in British waters.I always get a good few sessions in every year despite being a 100 miles from the sea!
The usual fight of a mullet is of a powerful run,especially in shallow water, as it realises it has been hooked followed by shorter runs similar to a turbo charged tench.Sometimes it takes a few seconds for the fish to realise it has been hooked but watch out the run will come.
If you are fishing in a harbour you will have to put up with boat chains,ropes etc and will need to tackle up appropriately.I would aim for an avon rod with a throughish action to cushion the lunges with an TC of abouut 1lb 1/4 or a 1lb 1/2.Line strength should be a minimum of 6lbs but prefarbly 8lb. In a harbour there is always a balance between good presentation and having tackle strong enough to get them out and the above would be about right. You will lose fish in such places but should get a fair few out too.
In open water or estuiarys then strong trotting gear can be used and line stregth scaled down to 5lb.This is where a strong carp match rod or tench float rod would be ideal.I use a Harrison Stepped Up GTI at 15ft and its ideal.
The hookI use for mullet is the Kamasan B983 which is light in the wire but strong and has a curved point.10 or 12 size is fine but you could down to a 14 if the fish are finicky.Mullet do not have soft mouths and once the hook goes in it stays in in my experience
If you can use a centrepin do, but if not practical a fixed spool with a good drag properly sets fine.
As for float, a crystal type waggler would be fine.Go for a preloaded one so you are not weakening the line by nipping on large shot.A large mullet will test tackle to its limits and you cannot afford any weaknesses.For this reasonI usually fish straight through rather than have any additonal knots in the set up.I'd recommend Silstar Match Team for line.
Legering is very effective and certainly some of the big fish of recent years have come out to legered bread simply link legered.A small cage feeder can be used.Use a quivertip as the bites can be subtle.
I would as Mark suggests try to get them feeding off the deck if the depth allows it although in a harbour the depths may be too great and you will need to fish at midwater or shallower.I would be careful about over feeding with floating bread as too much will simply take the fish away with the current as well as attract the resident gull population.A good technique is to get an onion bag and fill it with stale mashed bread, weight it and lower down the harbour wll after attaching it to a stanchion, railing etc.Every now and again give it a tug to release some fine particles.This should attract fish in to the area and you can get them actually sucking at the bag.