Absolutely right. It makes sense to me however it is not 100% clear from the following -
Extract from CAP 493
"Missed approach instructions shall include the level to which the aircraft is to climb
and, if necessary, heading instructions to keep the aircraft within the missed approach
area. The aircraft shall be instructed to contact Approach Control or, by arrangement,
to remain with the approach radar controller."
Can we have an answer/opinion) from someone from the Air traffic world please.
Also I would have thought the FMS in NAV would be better at keeping the aircraft on track than someone guessing the heading required from the Approach Room