In 2 weeks we will fly BKK-DXB-LHR with arr. 07.05 am @ Terminal 3 and departure from terminal 5 with BA to DUS @ 10.45am
EMIRATES is in eco. but with status privileg
BA flight is an AVIOS business class ( 1 pax is also BA silver )

My questions:
will EK be able to check through onto the BA flight ( them have interline agreement with BA ) ( we are on 2 tix ).
I heard the other way around BA would not check through anymore if be on 2 tix.

How long takes the transit from term. 3 to term. 5 ?
where you sugest to go to lounge ?

thank's for helping
Bert