On the contrary, it supports exactly the point made in the preceding paragraph, which even pointed out that the IEC standard came later.
The phrase "Should have gone to Specsavers!" comes to mind. All three of your examples clearly have notched connectors. Two have the notches at the top, and the Russell Hobbs one has the notch at the bottom. Their kettle leads were not C13.
So to repeat: When kettle power cords weren't captive, as they are nowadays, they weren't C13. I've already given an example of a kettle preceding the standard that didn't take anything like a C13 connector, and in vainly arguing against that you've ironically produced three more examples of kettles from later decades whose kettle leads were also not C13.
Here's yet another one, where the lead itself is in the picture. It's not C13.
If there had been examples of kettle leads that were C13, I'd have long since used them to really tease my late friend. But kettle leads in the U.K. have never been C13, and my late friend was right that "kettle lead" for a C13 power lead is a misnomer in the U.K..
The phrase "Should have gone to Specsavers!" comes to mind. All three of your examples clearly have notched connectors. Two have the notches at the top, and the Russell Hobbs one has the notch at the bottom. Their kettle leads were not C13.
So to repeat: When kettle power cords weren't captive, as they are nowadays, they weren't C13. I've already given an example of a kettle preceding the standard that didn't take anything like a C13 connector, and in vainly arguing against that you've ironically produced three more examples of kettles from later decades whose kettle leads were also not C13.
Here's yet another one, where the lead itself is in the picture. It's not C13.
* https://www.worthpoint.com/worthopedia/vintage-1970s-80s-had...
If there had been examples of kettle leads that were C13, I'd have long since used them to really tease my late friend. But kettle leads in the U.K. have never been C13, and my late friend was right that "kettle lead" for a C13 power lead is a misnomer in the U.K..
* https://www.specsavers.co.uk/book/location (-: