This policy leads to some strange situations. HEL-XXX-IST-YYY mixed AY/TK is ok on two different ticket stocks, but same PNR, even though it’s a OW/*A combintion, but HEL-LHR-ZZZ is not if it’s on different PNR. luckily we’ll have 9 hrs between arrival and departure, plenty to collect and move to T5 to recheck and still go to London for a lunch meeting.

Interesting to see, if BA would check to HEL on the way back