That will be one of the G-GATx series A320s based at LGW.

Seatmap here: CY177 | The BA Source

Note these aircraft have no bulkheads in front of 1ABC, it's open to the door and you'll be directly facing the crew in their jumpseats for take off and landing. Some people dislike this, others don't care.

As an aside, this is why choosing 1D/F on an LGW short haul always comes with the risk that you'll lose your seats due to a possible swap to one of these configs.