I have my mum's permission to post this, but she was actually ON that flight! She was, in fact, the 'lovely English lady' who told the woman to come and sit next to her (she did not say 'darling, darling...' and has never said anything remotely like that in her life!)
Anyway, according to my mum there were loads of alternative seating options, but when she (mum) suggested the man move to in front of them, his wife/oartner said he was fine! She (the woman) did speculate that they might get upgraded for their onward flight to Venice, but my mum says that absolutely no one was traumatised by the situation - although obviously sad for the lady who died and her family! - and this is a blatant play for compensation...