Yesterday I had a call with my managers and HR to discuss dropping to a 4-day week after my return from mat leave. The impression I got was they were being very guarded because of workload. They said it had gone up by 100%. My concern here is that this is largely irrelevant to my request for flexible working. Surely a 100% increase in workload merits an additional employee to do the job if I was already working at full capacity? I did not question this on the call because I am a slow thinking person and only reasoned this after the call. I am considering writing to HR about these concerns. Or should I just wait for the outcome?