It gets more interesting than that though. Under the Regulation of Investigatory Powers Act, if you decide to comply and hand over your encryption keys, or to,

It gets more interesting than that though. Under the Regulation of Investigatory Powers Act, if you decide to comply and hand over your encryption keys, or to, say, decrypt an email, you are legally obliged to not tell anyone that you have done so. But there is nothing in the law stopping you from saying up front "the only reason I would revoke my encryption key without explanation is if I'm legally obliged to by the cops under the Regulation of Investigatory Powers Act". And when you do so, anyone with a brain can draw the relevant inference...