Quote: "Are their not long term plans for T2C, get rid of T3 then T5A+, T5D & T5E?"
Interesting, is "T5A+" an extension? Think LHR-5D is on the cards (fire station may have to move). For LHR-5E, parts of LHR-3 will have to be demolished.
Alternatively, if the underground transit is extended to LHR-3, all the satelites and new ones nearer to LHR-3 could be used from both terminals, making Oneworld transfers a whole lot easier.
If there is to be no LHR-3 in the longterm master plan, maybe it, along with LHR-1, will be rebuilt north of the Bath Road (A4).