Hi John.
Yes, Mullet are difficult to catch on the fly but not impossible. A combination of Bread flies and feeding the water is possibly the most effective way to kick off your Mullet career but don't ignore more traditional flies. I have been fishing for Mullet in earnest (my wife would probably choose a different description) since early summer, down here on the south coast. Like Aidan, I am situated close to the River Hamble.
I was extremely fortunate to catch a 4lb Grey Mullet on my very first cast for the species, using a flexi-floss Bloodworm. True begginers luck. I had to wait considerably longer to beach my next Mullet. I became successful at hooking the fish but an expert in loosing them!
I have caught Grey and Golden Grey Mullet both here and in Spain on the aforementioned Bloodworm, Czech Nymphs, Red Tag, Epoxy Shrimp and sparse DNA Clousers. It seems that the fish are by no means selective. More a case of right time and right place. If you put the hours in, you will be rewarded.
As Aidan said, the scrap they give is incredible. I have had the fly line cut through my finger by a Mullet taking off for France.
A few weeks ago I posted a report of a Mullet catch on this forum John.
Here is the link.
Hot Lips
Aidan, if you fancy a crack at the Hamble Mullet give me a shout.
Cheers
Colin