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Please format your config so it is readable. What you have posted here is completely unintelligible, especially on mobile. Use code blocks for formatting or link to a pastebin or Github Gist.

It is probably way too late for that to make any difference, no?

Slander?! I resent that. In print its libel.

Yeah, no. He almost entirely verbatim copied the text and wording on the original article and shuffled some words around to try and make it less obvious (and failed). It is blatant plagiarism, there is no other way to call it. This was no innocent mistake of forgetting to list a source. Watch the hbomberguy video segment about it, it paints a very clear picture.

I am in central Europe and I have both the AirGradient One and the AirQ Basic. The AirQ is much more capable, with more sensors (especially a dedicated VOCs sensor), and has a better design, and the Home Assistant integration works really well locally. It is quite expensive though.

The AirGradient One took a long time to ship (almost three months, but that was expected and communicated clearly by the AirGradient folks) but it definitely is available for shipping to Europe, so probably also the UK. It has fewer sensors but you can (and I did) flash it and customise it with Esphome. Look for the github repos of user MallocArray. So it also works very well locally, using the esphome integration.

So it really depends on what you want to measure. If it is just Co2 and pm2.5 then the AirGradient is probably enough and much cheaper. With the AirQ you pay a lot more but you get many more sensors.

It’s called that because 20 years ago when the guide was first written there was no Gmail or any comparable service of that magnitude. Sure you had GMX or Hotmail but most people online back then had an email account hosted by their ISP. That was the most common way to get access to email.

The ISP Mail guide describes how to set up a mail server infrastructure similar to what an ISP mail service would provide, back then.