Coots Nest on back of boat

I wonder if someone could give me some advice please.

I live on a marina and one of the boats moored up has a Coots nest with 6 eggs in.  The owner of the boat arrived yesterday and started the boat up.  My other half went round to see him and told him about the nest and he should cut his engine.  The boat owner said he knew the nest was there and was hoping that starting the boat would chase them off!  The Coots were going mad, desperately trying to get back on the nest.  As soon as the engine was switched off, the female was straight back on her eggs.  

It now looks like the boat owner is getting the boat ready to move off, as he has an inspection booked, I assume to renew his licence as it has expired.

 

Is there anything I can do to stop him from moving the boat or is there someone I can contact?

I have checked the RSPB website and Coots are protected from 1 February until 31 August.