[Svip]

I am not sure the UK has traffic light cameras, but they do some places in Germany. And the official position in Germany, and in most of Europe I think, is that emergency vehicle decisions trumps everything else. If a police officer directs you to do something that would break the law, then you should do it, as a police officer's decision trumps regular traffic laws.

At least, that's how it works in Germany and Denmark. But I don't think Denmark has traffic light cameras. I've never seen them anyway. But I've seen them in Germany.

Of course, this is assuming you don't actually cross the entire junction, but rather just moves out into the junction, so the emergency vehicle can get through.