"We saw Peter Jackson and the other person was Stephen Fry ... the Tiger Moth landed and Billy Connolly got out of the plane," said Mr Harley.
After attracting Connolly's attention, the star stopped and posed for photos and signed autographs.
Mr Harley said he'd been a fan of Connolly "for centuries" and after getting his autograph on his arm made it permanent by having it tattooed.
"He was saying, the day before, him, Peter Jackson and Stephen Fry had actually been playing laser strike in the castle," he said.
"He's a really, really nice guy - just how you see on TV ... we were just so excited."
Fry also tweeted about the visit, saying: "Laser gun battle. Epic slaughter. Measureless carnage. Oh the humanity. It shouldn't be such fun."
Ms Cook also had her jeans autographed, and said it was really cool to meet the comedian.
"And at the end we said 'you've made our day, no you've made our month, no you've made our life' and he said 'you're not the first," Ms Cook said.