After the semi-final in 2016, I e-mailed Lisa Eaton about what went on and my own experiences. To be fair, she replied quite promptly and said that the club were gathering information, and statements, etc, and were encouraging fans to come forward. What came of it I don't know. My guess is that City were taking it at least semi-seriously but that they were powerless to do anything about it because as has been proven many times down the years, the Madrid police really are a law unto themselves. The fact that they treat their own citizens equally badly tells you all you need to know. What's even more laughable is that this is a Western European country, a fully paid-up member of the European Union, and they can still get away with it without seemingly any comeback whatsoever. Now, some might say that it's not really the EU's business to get involved in internal politics but my argument is that when these incidents often involve the citizens of other EU countries (and of course their own country) then they surely ought to have some say, plus I thought one of the provisos of becoming a member of the EU is that the country should have a decent human rights record, which if I'm not mistaken is one of the things preventing Turkey becoming a member, yet the fascist Madrid police are allowed to go around beating anyone and everyone up in full view of the eyes of the world and aren't accountable to any fucker.
When I e-mailed Lisa Eaton, I also e-mailed the British Embassy in Madrid and said that I know my complaint was fruitless because there's nothing they could do either. They e-mailed back refuting this and said that they take these incidents very seriously, then followed that up by effectively fobbing me off and telling me to make an official complaint to the relevant Spanish police department! I never bothered in the end, mainly because I was due to go back over there just a few weeks later with the other half for several days in Seville and Madrid, and knowing my luck they'd have probably fucking banned me from entering the country.
As for City having cameras filming the police, I found out after the match in 2016 that the Spanish government had recently brought a law in making it illegal for anyone to film incidents of police brutality. I don't know for sure how true this is, but if it is then it's utterly laughable.