@John H Woods
Nice idea but I'm sure the UK gov will make it illegal to post messages such as yours once GCHQ notice a flurry of messages with double encryption. They may not know who the recipient is intended to be, but they will certainly be able to force el Reg to reveal your identity even if you had posted as AC.
I haven't bothered seeing if I can find your public key but I assume you only used your own key. To be able to send private messages, you need to also to use the public key of your recipient. This becomes a bit unwieldy as an email system, since everyone who knows you has to try to decrypt every message you post to see if any particular message is intended for them. Would anyone ever bother decrypting every AC post in case one was intended for them?