Thanks for the reply TCAS.
In view of the limited space to increase RESA's to the recommended 240m/2x width for a code 3 runway, I wonder if in gaining the necessary CAA approval for the runway extension project, that the airport might be aiming to use
EMAS as a major plank of their argument to the CAA. I am not aware that the CAA has yet approved an EMAS installation in the UK, although I could be wrong?
Either way, I would expect the airport would have to show an overall improvement in safety by having this extension, not just wanting the situation of longer notified and usable lengths to market to prospective airlines.