Hi John, sorry no one has got back to you yet. As you say it is illegal to disrupt or interfere with any nest during the breeding season. There will be local councils or bodies that have for whatever reasons have legal rights to do so, in whatever particular place that may be. I would have thought that as the nest is on your house in your grounds, and that if you were okay with this, no one can remove it. As you say you are on the beach front, the birds will be well aware of the correct place to nest and I am sure will raise their young okay. I would leave well alone and the birds will do the correct thing. I stand corrected by anyone more knowlegeable than me, who can give you other information.