Jet2 into T3 sounds awfully cosy. Their current Summer 2015 based fleet sees upto 17 aircraft at MAN (7 x B752*, 6 x B733, 4 x B738). Bus transfers to remote parking, maybe? Ryanair's August based fleet should be 8 x B738 with several aircraft visiting from other bases. FlyBe is 10 based (6 x DH8D, 4 x E175) with several visiting from other bases. Twice daily visits (or more) by Aurigny too.
Quite how would T3 cope with all that - plus any growth in the interim, given that it does not appear to be in line for extension work over the next decade? Jet2 has a very large throughput of flights during Summer months and enjoys healthy load factors on high-capacity aircraft. The only solution I can think of is possibly changing the demarcation of where T3 'ends' and T1/2 'begins'. If Pier B were to be reorganised as a constituent part of the T3 complex, the above arrangements could work. Thoughts?
By the way, reference Icelandair additional capacity in late Winter / early Spring. Isn't this the time of year when tourists have the highest statistical chance of seeing the Aurora Borealis? Big business for Iceland ...
* Jet2 B752 number includes the leased Privilege Style aircraft.