Parliament has published the report by Gemma White QC into Bullying and Harassment of MPs’ Parliamentary Staff
You can read it here: Gemma White QC’s report.
The House of Commons Commission has published a response in which it states:
We condemn bullying and harassment of MPs’ staff and offer our full support to anyone in the parliamentary community who has suffered in this way.
The Commission does not employ the staff of MPs as they are employed by MPs themselves or via political parties.
However, the Commission takes very seriously its responsibility to ensure that Parliament is a modern workplace.