Hang on a minute ...
from my memory of the law, for the offence to be complete, it has to be shown the defendant was *able* to break the crypto, and that a forgotten password would not lead to jail.
What made the cops so sure - after being provided with 50 possibilities - that the guy hadn't forgotten his password ?
Otherwise we're back to the situation posited when the law was first proposed. Just send someone an encrypted (or sufficiently non-random) email, then call the cops, say "child porn" and sit back.
What's David Camerons email address ?
e2a: Just read that he refused to hand over the keys. One wonders how bright his legal team were ?
My son (who left home a few months ago) called me up a few days ago, asking for the passcode I had set on his TV, when he was younger. No way could I remember, despite going through all the obvious ones I use. And this is just a 4 digit number. Imagine a randomly generated password ...