Conversation so far:
what radio station did Humphrey Lyttelton work for?
Lyttelton presented The Best of Jazz on BBC Radio 2
how long was Humphrey Lyttelton with The Best of Jazz program
From 1967 until April 2007, Lyttelton presented The Best of Jazz.

Question: is that all that he did there
Self-contained rewrite: is presenting The Best of Jazz all that Humphrey Lyttelton did on the radio