BA are using cruise relief pilots for the A380 as they can't meet the training demand at present - perhaps a glimpse into cathays future too
Bollox. It's business as usual with a 'heavy' FO on three-crew and a 'heavy' Capt & FO on a four-crew. No such thing as an SO or dedicated 'cruise relief'. The heavy on the outbound flight become(s) the operating on the inbound flight.