I am sorry, Persistentdonor I reported your post, although I did say it sounded lovely.
GN does get frequent commercial advertising and it is usually done in a way to try to make us believe that it is really a long-term member recommending something they have really enjoyed.
An almost immediate example was someone ( a new name to GN) telling us very briefly that she had allergies to scents and perfumes and had found some nappies that didn't need washing in detergent - and that was the post said. It was reported and removed
Your message matched this style of commercial message. I do not think I had seen your name before, which is quite unusual, and then one or possible 2 short paras, the second one the link. It had all the signs of an advertising post.
How could you have done it so that it was accepted? Probably by a more extensive introduction telling us how much you enjoyed needlework, what work you did, that you had been/would love to go on a sewing holiday, like the one suggested and then asking members whether others had been on holidays like this and could they recommend any.
If I see anything that looks like advertising, I will continue to report it. GN admin then reviews the reports and can reject them if they think the post is genuine. With more experience than me, they clearly also thought this was an advertising post.
To think that London, or anywhere else for that matter, does not belong to any one demographic