Gavin
Building new stands (contact or bussed) over the present car park next to the M56 (what we understand to be "pier 1") always seemed like the most sensible first phase.
When complete, it should give the excess capacity to allow the next part of T2 to be shut down to be competed and so on to completion of the new T2.
Then the issues of T3 can be addressed. Whether that is an extended or new build complex for low cost carriers I don't know. Plainly T3 also needs a kick in capacity from T1 or some new facility. It is woefully lacking at present, and if T1 is to be demolished I don't know what could be done to improve that situation.