Layover: BA001 landed as BA002 was taxying out, so a there and back was impossible with those timings.
In the days of BA001,2,3&4 operations it was possible to operate BA002 JFK-LHR then BA003 LHR-JFK and this occasionally happened if there was a sudden crew shortage or other disruption.
I did it once and it was a heavy day's work.......