Interesting, I worked there back in the early 80's when it was still the Old Town of old.
The industrialisation of the cockle industry was a bad move driven purely by greed. In the old days the cockle dredgers were relatively small limited by unloading by hand, but they worked day in day out . Then one owner got a giant dredger that could load three times as much, so all the others followed suit. The public owned foreshore got built over with wharves & industrial equipment, quite why Southend council allowed this eyesore is anyones guess. Cockle harvests soared & before long they had to limit the trips the boats took as a "conservation" measure. They would have been better off limiting harvest to what could be unloaded by hand. Out of interest i made the very last Cockle yoke for John Dickens back in the late 80's.
Then gates appeared across Bell wharf which had been public access for centuries. The Boatyard restaurant built its eyesore balcony out into the creek. Its a yuppified dump that has no soul.