Although there are many stories about Bonham's reckless/outrageous behaviour, he didn't enjoy doing interviews and being in the spotlight as much the other band members. (Like Robert Plant or Jimmy Page)

So unfortunately for us fans, interviews starring Bonham are extremely rare.
I have searched far and wide, but these three clips are the only ones I have found.
(If you know of any others, please contact me.)

John Bonham and Robert Plant talk about how the music scene is different from when they were growing up, on the London & The South East BBC show: NationWide
After 8 consecutive years of The Beatles winning the annual Melody Makers Pole Winners Awards, Led Zeppelin knock them off the top. The interview was conducted in 1970.
5:33 13.1MB
Billy Connolly interviews his friend John Bonham on the TV show "Alright Now". This is a painfully short and awkward interview, as Bonham's unusual answers to the questions are how do you describe...
This was the last television interview he did as it was only filmed a few months before his death - 19/07/1980
0:46 1.9MB
This is an interesting interview from 1971 featuring all the band members. (just after the release of Led Zeppelin IV) Bonham talks briefly about the "Zeppelin Sound" and the differences between Led Zeppelin I(the album) through to Led Zeppelin IV.
5:35 13.1MB

If any of the videos aren't working please email me and I WILL fix them.