I managed to protect my equanimity and forbore.
The Lady whom had pointed out the offender some moments earlier, then whatsapped how are you to someone on her phone. Two minutes passed and she began to slander the person for not answering it straight away. I think she implied her to be a psycho and sent another two messages asking why the delay. She exclaimed several times that she had noticed the offender had logged into whatsapp in the last 5 minutes and must have seen her message. I was wondering if with Brexit looming ominously and Britain being in for its biggest self-inflicted ecnomic upheaval since world war two that the recipitent may have had her job automated by Davos man.