What do I do when Milo bites people, and how can I stop this behaviour?

ATM we are saying "No!" or "We do't bit people" and then put him down and walk away, so no interacting. If I do much more than this is laughs hysterically and does it again!

Its driving me crazy, and yesterday when I collected him from creche we were told they're had to stop him from trying to bite one of the kids!

Any suggestions?