Was fine on yesterday's 09:40 MAN-LHR flight. Looked like one person boarded as group zero.
Still ended up queuing on the airbridge.

LHR-DUB flight around 12:50, called group zero.

Group 1 was queued up in the left lane, and the agent at the entrance put two women and myself as group.1 in the right lane.
The left lane was opened for group 1, the agent looked at the right lane, and the two women were now possibly group 2, so had to wait behind them (or DYKWIA? and push forward).
Usual rewarding of group 3 boarding for the 10 or so who checked bags in, but they went downstairs before anyone else as far as i could see.