Yes all bmi owned aircraft are now at LHR.
The ones which haven't transferred across to the BA AOC are waiting outside the hangars at LHR whilst they try and rush them through. Transferring AOC is not just paperwork. It also involves fitting the aircraft with BA SEP equipment and the like. Usually the process takes 2-3 days per aircraft. Once the aircraft have transferred across, they will be released for line flights for BA. There is a complex schedule for getting the interiors changed and the aircraft repainted into BA Union livery.
The A321's take a while as the cabin upgrade takes about 5 weeks as new lie-flat seats and IFE are being installed as part of the new BA mid-haul product. This is part of the reason why Cairo is only moving to T1 and A321 ops in January as a substantial proportion of the ex-bmi A321's will be offline for cabin fitting or painting until the end of December.
So far, about 75% of the fleet has already been integrated into BA. G-MIDX (Star Alliance jet) is currently in the paint bay having her BA spray. G-DBCA is having her interior stripped of anything related to Lufthansa and being configured into BA configuration like her sister A319's as well as being transferred across to the BA AOC.
The last aircraft will be fully integrated into BA (cabin refresh, AOC, paint all completed) on 31st December when G-MEDG rolls out of Iberia's paint hangar in Madrid.
Champ