Originally Posted by bd95

As has been said, the OP arrived late and endured the consequences, but….

The vast majority of my T5 flights haven’t shown a gate until at least t-50 and in many cases t-35 or later (for allegedly on time flights but obviously faced a delay in boarding). A recent flight showed an A4 departure with “go to gate” and “gate closing” soon after at t-50, causing me to move swiftly from the north lounge only to be held at the gate for approximately an hour while they got their ducks in a row, with a further on board delay as the fourth bus went AWOL.

I think BA’s sister EI has the right idea showing the gate close time as the departure time in their app. That’s all that matters these days. Who cares what the alleged fictional departure time is, all that matters is the final time to be accepted at the gate and the likely arrival time at the destination.