If laws aren't transparent and reasonable, you shouldn't necessarily follow them. If I were to sell encryption software that's banned in Kazakhstan, you wouldn't expect me to stop selling to customers there, would you? I see no reason why the United Kingdom should be treated any differently than Kazakhstan in this case.

The British government is certainly not as authoritarian as those in China or Russia, but that doesn’t change the fact that it’s still terrible and restricts people’s rights. For example, you can be detained for as long as they want if you refuse to unlock your encrypted device.