I read somewhere (tripadviser but it was from 5 or so years ago) that in the Duty Free shops at the airport OTP,
Duty Free shops -> Where?
Are you sure you don't need to pay any government-imposed duties on these products?
I'm on a flight from Bucharest. Back to LHR.
OP intends to fly from one EU airport to another EU airport. Hence, I really doubt that the so called "Duty Free shop" does not collect government-imposed duties on the products sold.