I can't wait to see Ryanair's "BA chose us to rescue its passengers" advert.....
I would have thought BA have thought quite carefully about this. There will be a contract in place for RYR get well paid to... a) fly BA passengers and B) Keep their mouth shut on this issue.
RYR will be quite happy to do this because they don't need to say anything. The press will do it for them and they are getting BA pax on their aircraft, possibly for the first time - maybe not the last.