No. Provided its checked all the way. You will need to move from one end of the airport (domestic) to the other end (international)

When you arrive from Kras, hang a right, walk all the way to middle of the terminal, international departures to London is on the second floor. You need to clear passport control first, and security + Nudescope.


BA tends to use the same gate on the second level, same level as the Swiss Lounge.

Frankly changing planes in London is more work.