Thanks fjencl, that seems to be the latest state of play. It would therefore appear to rule out A319/320 type operations then. I do wonder if a diversion of such a type would be permitted or not under the conditions.
I think if I was Stobart, I would now go back to the Council and clarify that such updated and more environmental types such as E190/195 and A220 are included, if necessary quoting the mission creep over the years at LCY.