Apparently a motive other than egg-collecting, simple hatred of ospreys or a grudge against the authorities concerned has been suggested to the police and they are taking that seriously into account. It is sub judice so speculating as to the perpetrators, while only human, isn't much use and could even prejudice matters. Such a stir has been created by this that the police are having to take it very seriously, although to be fair they were doing so anyway.
Just went to check FB to make sure I had my facts right about motive and found that although Llyn Brening and NWWT were going to erect a replacement platform this morning a "group of wildlife enthusiasts" got in overnight and erected a new platform!
Personally I'm very suspicious and if I were lLyn Brening or NWWT I'd take that platform down in case it has been poisoned in some way.
Even if their intentions were good, they have still broken the law and created a muddle. How would you erect something like that, from boats, in the dark?