Audio clip of the PAN call to Shannon giving estimated location of laser attack, states other pilot able to do PNF duties for the turnback to LHR:
http://airportwebcams.net/VS25B.mp3
FlightAware plot:
Virgin Atlantic (VS) #25 ? 14-Feb-2016 ? EGLL / LHR - KJFK ? FlightAware
They were cleared direct STU, jettisoned fuel and when queried in a later ATC exchange said that they had swapped PF and PNF duties due to the medical situation.