but the report of the tragic accident in 2006 was to some degree critical of the service provided by Southend ATC and resulted in several safety recommendations for procedural changes
Reading the report, which you are good enough to provide a link to, I wouldn't really agree that the report was critical of Southend ATC. 4 safety recommendations are made, 3 of them to the CAA about revision of general ATC procedures. The fourth was to Southend, but was directed at better information in their MATS Pt 2, not a procedural change as such. I think most observers concluded that the accident could have happened in the same way at almost any controlled airport.