The right way to respond to this reality would be to stop UK government from being insane by electing a more sane government. Stopping using iphones is going to help only for a short term - once encryption is de-legalized, they will come for everybody who they deem worth coming for, sooner or later. If it'll require introducing licenses to run encryption software and mandating key escrow, they'd do that. Yes, you still would be able to sneak in encrypting software on USB drive hidden in your... let's say, pocket. But the mere fact of using it would make you a criminal then. That's the natural progression of where it is going, unfortunately.
UK government had been consistently working in this direction for decades. It's not "on a whim", it's a known and consistent policy, and yet there's no substantial resistance and pushback. The only reasonable conclusion is that the majority of the population is OK with what's going on.
