Below, I pasted the review, followed by a bit from the judge. Written word has to meet a number of criteria to be libelous, but the core of the decision, I think, was that calling something a "scam" is a statement of fact and not opinion. https://www.legislation.gov.uk/ukpga/2013/26/section/3/enact...
""""*A total waste of money another scam solicitor* [Person X] left the company half way through my assessment and the replacement was useless. I paid upfront for a legal assessment of my case, but what I got was just the information I sent them, reworded and sent back to me. No new information or how to proceed or what the law says or indeed the implications of what was done. I Just got their false assumptions, full of errors showing a lack of understanding for the situation and the law. Once they have your money they are totally apathetic towards you. You will learn more from forums, you tube and the Citizens advice website about your case, for free"""
And a small bit from the judge's decision-- """"An allegation of dishonesty, fraud or attempted fraud will usually fall fairly and squarely on the side of fact rather than opinion. The same is true also, as I have already mentioned, where the allegation is of "reasonable grounds to suspect". Accordingly, I cannot allow a pleading to go forward in the form of paragraph 19A. It must be struck out.""""