BA 319s/320s
Presumably at some time in 2014, BA are going to quit T1 (schedule published for other airlines to transfer out, mostly to new T2 but BA not mentioned).
Would guess most BA T1 destinations might move to T3 but Belfast & Dublin would presumably have to go to T5, with some existing T5 routes moving to T3?
If remaining ex BMID 319s move to LGW & ex BMID 321s being fitted with ULD, then (with addition of new 320) LHR fleet is 100% ULD.