Three more data points today.

LHR gate A7 for 1100d to BHD
Gate lead made a manual call after the automated announcement for families with small children, those wanting extra time, and group 0. I went to the side and was pre boarded behind the gate. Once boarding started I was sent down before the other pre boards.

BHD 1550d
Again nothing done. Door was opened from the lounge so I and others meandered out. Call was made for those with young children, them groups 1-3. No mention of 0.

LHR gate A13 for 2045d to NCL
Pre boards done and those wanting to gate check bags. Specific automated call made for group 0. I collared the floater and she brought me around to the side so I could wait behind the gate with the pre boards. All send down together once boarding started.