Well, the rumor is that Apple has secretly appealed the order (which is officially secret) to whatever secret tribunal reviews such secret orders to create secret features giving secret government investigations access to various people's secrets. The Court of the Star Chamber, I think it's called.
Which is at least Apple doing something vaguely like fighting. But, yeah, UK citizens might want to think hard about doing something about the situation themselves. For one thing, Apple will probably lose. And the US government isn't going to have Apple's back against the UK, either.
It's a job for the democracy and voters.