Are you a constituent of the Tory MP Daniel Kawczynski? Have you written to him recently?
If so, you'd better read this as a matter of urgency.
Police now believe they need no warrant to enter an MP's parliamentary offices and demand copies of a constituent's correspondence. They know about your emails, your phone calls, and which websites you visit, and they don't need to intercept your written letters. They can just demand them from the recipient.
Even if the recipient is an MP.
But we aren't a police state. Oh, no. That's just paranoia.
Update: Penguin points out in the comments that the police claim there was an appointment and that the MP handed over the letter voluntarily. The MP claims the police demanded to see constituency correspondence and that he heard of their appearance in his office when he was busy giving a speech.
It's not clear cut yet but someone is lying big time, and this won't end without egg on someone's face. Either we can't trust the police or we can't trust our MPs or both.
I suspect the answer might well be 'both'.