I've just come across these two short interview clips on YouTube:
...Hank and Bruce in the run-up to Eurovision with Brian Matthew...
https://www.youtube.com/watch?v=xwoFlow9UV4
...and an interview with all four of them during their tour of Australia in 1967. Apart from the Live at Sankei Hall LP and a Cliff TV special don't think I'd ever heard John Rostill speaking before finding this! Some interesting opinions on current music!
https://www.youtube.com/watch?v=lkNeIBBfQxM&t=386s
Is that Bruce telling Hank off for 'butting in'? Quite an interesting insight into the group dynamic only a year or so before they split.