I think just about everything Jimi Hendrix ever recorded has been preserved and reissued in one fashion or another. The BBC Sessions were re-issued in 1998 and are probably still in print.
But in the odd event you aren't familiar with them, here is a set recorded in session at the BBC on December 15, 1967.
The Jimi Hendrix Experience In Session At The BBC
December 15, 1967
1. Day Tripper
2. Spanish Castle Magic
3. Radio One
4. Wait Until Tomorrow
The inimitable Mr. Hendrix.