Ok I have done a bit of research through a friend who is a biologist with an interest in birds of the ratlike persuasion.
He said the best way to get rid of these avian pests is to reduce their numbers in your direct area by disturbing their nesting habits. Whilst not being specific and or condoning violence towards these ariel pests. He basically said that you should target the boats that are never visited i.e. mooring minders. Get on board boot their nests into the ocean on a regular basis and they will move on to another perceived safer area. He said if you could stop them nesting for a season then you would halve the numbers in your bay 2 seasons would see them basically cleared off. He said that they would go somewhere else and nest and it would not lead to a decimation of bird numbers. As they are territorial ,the more they are disturbed they will force excess numbers off the mooring minders and out of the bay altogether.
The basic problem is mooring minders that are never visited.
Whilst I hate getting on someone else's boat uninvited in this case I think that it is the only way, these people don't give a stuff about their boats and the RMS don't seem to care enough to really do any thing about mooring minders.
Oh yeah apparently the owner of the piece of crap trimaran near me paid his overdue mooring fees and that is the end of the RMS interest in this rubbish boat. So it will stay to remain a bird haven.
Any way I now have a cunning plan Baldrick to see my bay free of sea pests within 2 years.
Hasta La Vista seagull