What do you mean by 'ghosts'? Getting into trouble is the last thing I want to do. In the past, I've gotten in trouble for announcing things that hadn't been officially revealed. That begins in January," he continues.
A familiar shot of Button house with the comment "Hello old thing" marked the start of filming for co-writer Jim Howick, who also plays Pat Butcher. Series 4 begins rehearsals this week.
During the announcement of the renewal, Ghost producers said: "Our fourth season at Button House is a dream come true. A new set of interesting stories is in the works, and we can't wait to share them with you."
BBC has teased season 4 details. "In season four, Button House's gatehouse is open. Can Alison and Mike run a successful B&B, or will spirits interfere?"
Charlotte Ritchie told Digital Spy: "Heaven! Funny! Everyone's hilarious. Every actor is a genius... I'm really thankful for it." She also gave a filming update in March.