The paper posted above is an interesting read.
The point it appears to be missing is the name of the male and female ponds, which per the SC ruling give a biological meaning to sex the ponds are allocated to.
They also use S158 as a potential fall back position which fails because that only applies to further disadvantage being addressed within a particular protected characteristic, it is not available where there are two or more characteristics involved.
They also suggest that there is no identifiable incidents that have actually occurred, and seem to think that therefore there is no risk of harm. Ignoring perceived or potential risks.
Whilst at the same time proposing to spend a significant amount of money to provide more privacy, and safety.
They are also suggesting that the proposed arrangements, option 2, would fall within “a proportionate means to a legitimate aim”. Which is an incorrect analysis of that particular exception, because it relates to a single protected characteristic grouping.
In effect they have advised the committee to keep the status quo, because the legal advice says they will get challenged either way,
They need to get better legal advice.