I contacted NICE to make sure that I wasn’t going to be pursuing this issue like a dog with a bone unnecessarily. I wanted to know –

Do they consider NRLS data within guideline reviews?
Is it the ‘right sort’ of data
Would submissions by the public on this type of system hold any weight within a guideline review?

They didn't fully answer my questions but I wrote a blog about it.

https://www.mefoggydog.org/2023/11/14/shake-it-up-nice-and-the-national-reporting-and-learning-system/

I have now written to the NEW Health Minister (another one) Victoria Atkins MP and Wes Streeting MP as mentioned in the blog.