[rahimnathwani]

The two examples are not equivalent. One is about whether or not a contract is formed, which requires specific steps under English law (roughly: offer, acceptance and consideration).

The other (consent to receive spam emails) has nothing to do with contract law.

[yebyen]

We can probably at least agree that two wrongs don't make a right... they are not equivalent but both are wrong according to the law, if not totally illegal. In fact I'm no English law expert, but I'd wager that while the spamming is actually illegal according to the law and the judge, the invoices GP proposed are simply unenforceable and not actually against the law.