It is on the BA site as for sale but not announced by the looks of things..
Flight details
Flight: BA2239 Non smoking
Operated by: British Airways
Departing from: Gatwick (London) Terminal N
Wed 4 May 2016, 13:50
Arriving at: Lima
Wed 4 May 2016, 20:25
Number of stops: 0
Flying duration: 12hrs 35mins
Aircraft type: Boeing 777 jet
Premium Economy Class: T
Economy selling class: N
Business selling class: I