You can only be banned from being a director if formally disqualified under the Directors Disqualification Act which normally means you've been guilty of fraud or wrongful trading or if you are yourself bankrupt.
If he's neither of these things then there's no legal reason he couldn't be a director. The company itself going bust doesn't necessarily mean the director did anything wrong or is automatically banned from acting as a director again. It's fairly meaningless anyway. He could still set up and run a new company with nominee directors such as a wife, brother, sister, son, daughter, etc.