Hingerford,
At this time these are unknown.
89635A A6-140 and 89635B A6-141 both left Doha 16/5, presumably en-route the UK, I have photographs of them taken on departure. The hex codes were first noted 14/5 departing Dubai en-route Doha and were recodes from their previous. 89635A has again been positively identified as A6-140 as late as the 28th May in the Stansted area. It is however possible that they have been recoded again but positive confirmation is awaited.
Thanks
Alan