I am not looking forward to another lengthy and pointless discussion with Amazon... They really are not fun.
What now?
I have listings for things like this...
Amazon seem to feel that using "WAGO", a trademark name, needs a letter of authorisation.
Thankfully I know someone who is good at pointing me to legislation, and, as I expected "Nothing in the preceding provisions of this section shall be construed as preventing the use of a registered trade mark by any person for the purpose of identifying goods or services as those of the proprietor or a licensee".
So, yes, I can describe the 3 pin WAGO connector as a WAGO connector. I have tweaked to be clear, changing "with 3 pin WAGO" to "with 3 pin WAGO connector", just to be extra clear. And quoted the Trade Marks Act 1994 section 10(6) to Amazon.
I do not hold much hope that this will be a simple "OK, that's fine". But they may yet surprise me. We'll see.
Update: Yep, stock replies, this is going to be a long one.
I've also added this image to the listings :-)