Classical music in the nuclear bunker scene

Dear Jjackyne,

Excuse the lateness of this reply.
Only watched the series this morning.
Used track ID care of mobile to ascertain the piece of music in question.
Without further ado the music is by


W. A. Mozart
Piano Concerto #17 in G, K453
2.Andante

Furthermore according to the Track ID log the artist in question was
Vladimir Ashkenazy : Philharmonia Orchestra Album: Mozart: Piano Concertos #21 & #17

Please be advised that I will re check this information in the next few days just in case.

Hope this has been helpful as there are few things as annoying as not knowing what a particular piece of music is called.

Regards