Reasonable adjustments are a legal right, not a privilege.
ND people are their own best advocates in what works for them.
If performance dips, very important to find out why as, all too often, MH issues get treated punitively.
If the person's role can comfortably be done at home, let this happen. It means no travel stress, no noise stress and relieves the anxiety of having to be around a lot of people.
Boundaries are so important. If melt down or shut down is happening in the workplace, take that person's lead. Don't rush them somewhere quiet and expect them to talk to you about their "upset", however well meaning. Ask them what you can do to support them for if this scenario happens. For me, I need quiet and leaving the fuck alone.
Remember that equality and equity are 2 very different things.
I'm one of 4 network leads in work for this very thing, as my employer state that they're a fully inclusive employer. They may be, but they forgot to tell their managers this.
We're currently looking at getting one of the execs to sponsor us so we can get an annual budget to keep raising awareness and support our colleagues. We've asked for a quiet area on each floor which can be a sensory space. It looks like we're getting it!
Come over to the neurodiverse mumsnetters board too! Look at autism UK website for resources.