I find it so interesting that many many posters rush to feel empathy for the Trans employee and fill in the details of the story in their imagination- may not be trans, just offered to help, perfectly innocent, like offering to help with bacon etc.
No empathy for the mother and daughter who have said the employee was a man, he approached the girl who appeared to be alone in the lingerie department.
Those are facts, undisputed by M&S. the details you fill in from context- M&S don’t have staff hanging around offering to help. They are engaged in tasks, you seek them out of you need them; ‘help’ in a lingerie department inevitably means talking about underwear, not bacon; men should not approach young girls under any circumstances but the most dire.
So where is the empathy for a mother and daughter who were alarmed by a man trying to discuss underwear with an unaccompanied child?
Where is the empathy? Why is it all directed to the employee?