We have since covered them in wire mesh to improve the footing but wonder if that’s sufficient to protect us from a claim in the event of someone falling off and landing in the water?

Shooting legal advice
Well done for conducting a risk assessment and acting on it.

Such appraisals can be a real bore to compile but I’m afraid they are necessary in this litigious day and age.

Wire mesh is generally accepted as a good solution in these circumstances – we’ve all seen far worse.

However you might consider a handrail if you still think there is a risk.