Would it be possible to have two beacons that emmit a signal at each end of the runway? Both on the landing / take off path. Name them beacon #1 and #2 for example.
Beacon #1 nearer the runway at both ends. That way the aeroplane would always pass the beacons in the order of 1 > 2 on take off and 2 > 1 on landing. Beacons are positioned at a set distance from the runway and any aeroplane that is at a set height , speed range and passes the beacons in the 2 > 1 order will know that it is on a landing approach. The system then interogates the landing gear selector and if it is at 3 reds, and at a speed that would indicate the intention of landing it will automatically deploy the landing gear.
I don't know if this is in place already but surely this system would save £69 mill whenever someone makes an unfortunate mistake?
If this has already been thought of then I apologise for wasting time.