I couldn't find in the National Sound Archive.

But they do have:

"A double life, a singular skill."
A Radio 2 arts programme from 1996 presented by Sheridan Morley about Rozsa and Herrmann
with contributions by Amis, Rozsa & Herrmann (from the archives)

Rozsa's "Desert Island Discs" from 1984
where Rozsa selects his favourite records

plus an interview of Rozsa for a special on Heifetz 80th Birthday.

Undoubtly the BBC archives have more, but they are not public accessible.

G.