Shanties were not sung in the Royal Navy as work songs but singing was allowed during off duty time in port.
The reason that singing was not allowed is that orders might need to be given during any manuover and needed to be obeyed instantly, the sound of singing could mask the order.
Saying that the standard of training was very high in the Royal Navy.
It is said that Captain Hardy of the victory could control the sailing of the ship using hand signals alone.

I am going to Portsmouth tomorrow to take part in the re-enactment on tuesday.

I will be following this thread with interest.
dave