I’m sure I recall Johnnie Walker doing the charts in the early 70s on a Tuesday lunchtime on Radio 1 (247MW), with the number one announced at 1pm. He was someone I loved listening to - he seemed cooler than the likes of, say, Tony Blackburn and/or Jimmy Young - even as a kid I thought their props a bit naff (anyone remember Blackburn’s barking dog, Arnold, and or Jimmy Young’s “what’s the recipe today, Jim?”, on his ‘JY Prog’?).
There were also Emperor Rosko and Stuart Henry (“alright, m’friends”) who both stood out as being a bit different.
I didn’t really catch much of Johnnie Walker’s more recent time on the airwaves, but when I did hear him he still had that fabulously cool radio delivery, and not a barking Alsatian anywhere to be heard!