T1
We know T1 is creaking and long term will be resolved. Passing through T1 today, we also know the 30 minute line up to pass the UK border isn't the fault of MAG.
However, the age old problem of non working escalators. Multiple buckets around baggage reclaim belts and half the skyline walkways being u/s are entirely fixable.
Please don't let the the terminal fall down before you knock it down.