I was astonished that in fact the ruling was about whether Mermaids could challege LGBA from registering, and on reading the judgement it implies others might have grounds to do this.
... in order for Mermaids to be a person affected by the decision, the Commission’s decision itself must relate to Mermaids in some way. The decision under appeal in this case does not relate to Mermaids, it is not about Mermaids nor its work. The decision is about LGBA and although Mermaids was interested in the outcome of the registration process, ... , such an interest or even engagement in the process does not vest Mermaids with a right to challenge the decision. The extent of Mermaids’ engagement in the Commission’s decision-making process is not relevant to the question of whether they are or may be affected by the decision.
It is very clear to us that Mermaids profoundly disagrees with the Commission’s Decision emotionally, politically and intellectually. We acknowledge that this disagreement is sincere, as are the concerns that have been voiced before us. Furthermore, it is apparent to us that many of those that support the work of Mermaids or those it supports also strongly disagree with the Decision. As noted by the Commission, they may well have had valid cause for complaint as to what LGBA and its activists have said in the past. However, applying the facts to the actual legal issue before us, the fact that Mermaids and those they support have been affected emotionally and/or socially is insufficient to provide them with standing to bring this appeal, no matter the depth of the feelings resulting from the Decision or the strength of their disagreement.
For these reasons we conclude that Mermaids is not a person who is or may be affected by the Decision and accordingly we dismiss the appeal
https://www.judiciary.uk/wp-content/uploads/2023/07/Mermaids-v-Charity-Commission-judgment-060723.pdf
Statement from LGB Alliance https://lgballiance.org.uk/historic-win-for-lgb-alliance/
Statement from Charity Commissioner https://www.gov.uk/government/news/charity-commission-responds-to-mermaidslgb-alliance-tribunal-verdict (which has its own thread https://www.mumsnet.com/talk/womens_rights/4843004-charity-commission-statement-re-tribunal-judgement-on-lgb-alliance)