http://www.theregister.co.uk/2007/10/03/ripa-decryption_keys_power/ - It's now illegal for you not to supply encryption keys. Funny thing is that if someone encrypts something using a key that they are pretending is yours, you're still legally liable to produce it. Isn't that cool?!
There was a very good pictorial produced by
Stand many years ago that I'm trying to find that highlights how stupid this law is.
As always, if you've done nothing wrong, you've got nothing to fear. Keep repeating that. It may become true at some point.