As an inexperienced youth I spent many holidays down around Christchurch / Boscombe / Bournemouth and I can remember very clearly the enormous mullet seen from a bridge near Christchurch that would take huge lumps of crust off the surface - -dozens of them !
Cast a line though, and not so much as a bite !!
How did a London boy know they were mullet ? Well, I asked the man behind the counter in that tackle shop near the Royalty - simple !!