BEA/BOAC callsigns/codes
Hello
Before BOAC and BEA merged to become British Airways in the 1970s, what were there callsigns and codes? Did BOAC use the "Speedbird" callsign, as mainline British Airways does today, and what where the codes, like BA is for British Airways today. I think BEA used the code BE like flyBE does today, but am I correct?
Luke