Trying to get in on a fake passport - ooh, that's naughty; lying to an immigration official - ooh, it's getting serious now; giving an obviously false date of birth - listen, we are a serious border agency doing a serious job and we are here to make a difference. Now, would you like asylum? How's about a nice little London flat while we send someone round to talk to you? OK, see you in two weeks then.
Why even bother checking the passport? Should have just waved him through without any checks at all, the result would have been exactly the same. People really get paid for this?