Why do people give such misinformed advice!? It's beyond ridiculous.
Yes, he can oppose the move, especially if it's a fair distance away.
No, he does not need regular contact to oppose. He has PR, meaning he has legal rights. He can file a C100 application in court, Prohibited Steps Order/Specific Issue Order - read up on these.
Contact a law firm, and get a letter written to him through the firm, stating what you're intending to do. Give a timeframe for a response, and then, depending on what and if he responds with, move. He can STILL oppose, though. At any time. He can demand contact, etc, through the courts.
Other posters, unless you're a family law solicitor, stop giving advice that is incorrect. It could really alter the course of a person's life.
Equally, the person looking for said advice, stop looking on the Internet and speak to a professional.