I think this is going to be a case of diplomacy on your part. They can and have done it, but whether they should is a different thing. I don't know if it is illegal.

If it were me I'd pop round and ask if they could lower them below the fence line as the flashing from them is disturbing you. If it was me it would in fact trigger a migraine.
they may not even be aware that it is causing you a problem and will happily lower them.

welcome to GoY too.

Thanks for your comments. We have experienced a few unwanted headaches just recently . will try what you suggested.

Why have they got the CDs there? We used to use unwanted CDs to discourage birds on our veggie patch.

Some people hang them in fruit trees to try to put off the birds, moongrower. Doesn't work very well, in my experience!

People tried CDs on our allotment site to protect their crops from pigeons. The pigeons just admired their own reflections.

Hmm...I guess that you can hope that while they are primping, they aren't eating! :)

And in a few weeks the coating which makes them reflective will come away and they will be left with clear discs. At least we were when I tried it for bird scaring.

Oh it took months for that to happen with our CDs

Gentler rain where you are then M.G.!

Don't think so...