“For me it will be the first time seeing it, which makes me a little nervous,” admits Runrig’s lead singer Bruce Guthro.

He’s just touched down in Glasgow from Canada ahead of the band’s movie premiere at the Royal Concert Hall on Saturday.

He nurses a coffee, sits against a backdrop to the city’s skyline, cracks a smile and adds: “It will be fun.”

Incredibly, it’s a year since Runrig completed their Final Mile tour with The Last Dance gigs in front of 50,000 fans over two days in the shadow of Stirling Castle. The fact he is here, shows just what it still means to him.

“We’re very proud of this, no stone has been left unturned to put this package together as it should be, as a tribute to the fans and, to a degree, to our legacy. I don’t think anyone will be disappointed if they are a Runrig fan.

“In some ways we’re all fans of each other so it will be fun to sit there and watch it. If the film represents the days, which I believe it will, then there’s not a bad memory.”

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The grass beneath Stirling Castle was turned into a sea of tartan, Saltires and Runrig T-shirts from through the ages when fans and band members alike shed tears in the rain, for the end of a 45-year legacy – of which he pushed them forward for almost half.

“This my first time back since then,” he says: “I’m excited to see everybody – the band and crew. I was as tight with some of the crew as I was with some of the band, I really liked and admired and respect the work that they did.”

“I probably haven’t had the shock of ‘Oh my God, we’re done’ yet,” he admits. “I’ve been busy with life. To a degree the band are the same because they have been busy with this project. But I think it will be harder for some in the band, because it was their life. For me it was 20-year journey, for some it was 45 years. We all agree it was the right time.”

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It will be a strange sensation for Guthro and his fellow, now ex-band mates. A room full of fans watching their last show together in a three-hour long, high definition epic captured by Bafta award-winning digital entertainment company Blazing Griffin, from Glasgow.

Naysun Alae-Carew Managing Director of Blazing Griffin said: “We're looking forward to the world premiere of The Last Dance and seeing the fans’ reaction. It's an epic music film, our first and one Blazing Griffin will never forget.”

Bruce agrees, and said the memories from the occasion remain just as vivid.

“Magic,” he describes it. “It was a bit surreal, as it would be for anybody to know that this would be it, in particular the Last Dance, that these would be the last shows.

“I just tried to soak up every moment I could, live it and enjoy it, and focus on the show because that had to go on.

“I know my life is going to go on and I am going to continue in music, and I’m sure other members of the band are going to do the same thing. It’s not like music has been taken away from us.

“But this union is being taken away from us. We’ll never do this again as a band to these crowds, and that was always a conscious part in the back of my mind.

“I don’t look upon it as sad, I refuse to. I’ll leave a piece of my heart here and know it was satisfying and move on to my own career and maybe some projects with the lads in the future... we’ll see.”

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From their very first ceilidh dance in 1973 to playing to so many thousands of fans over a wet weekend in Stirling a year ago, Calum MacDonald always wondered what it would be like. How it must feel to dance, to sing, to cheer. This Saturday, get gets his chance.

“We’ve often talked about how good it would be to go to a Runrig concert and experience the thing, it’s always been an aspiration, and this as close as we’re going to get to doing it,” he says, “I’m looking forward to it, it’s going to be a very unusual event.”

He’s not wrong. The Last Dance screening at the Glasgow Royal Concert Hall will play to an audience ready to relive the experience of Runrig’s final gigs and, as a founding member, he is looking forward to the experience as much as the next fan.

“It’s been extremes,” he continues. “In some ways it’s like you’ve never been away because of this film project, we’ve been hands on throughout the year so it’s like you still haven’t exited the stage.

“That is good because it gives you time to come to terms with it, because on the night it was .. I’ve never experienced three hours pass so quickly. It was over in a flash.”

“It was a concert like nothing I’d ever experienced before, and we knew it was looming. But the final one was always going to be difficult and I remember approaching it and saying ‘you just really have to enjoy this’.

“I really tried hard to do that. I kept saying, ‘this is the last time you will ever play this song ever, just go on the journey and take it on board’.”

The emotion on stage was clear, captured in the film being released on DVD on Friday, but he admitted he had one other issue to contend with – he had never before addressed a crowd in the four-and-a-half-decade history of the band.

“It’s very hard to articulate how you feel, you got very emotional,” he says. “I don’t normally talk on stage, but I did at the end. I knew that was going to come, so I had to focus, so that kept me in line. I can stand up in a room and talk no problem, but I’ve never done that in front of 25,000 people, and I was terrified.”

Saturday’s show will feature the full three- hour set, minus just two tracks for production reasons, and the Q&A session. And he says they are looking forward to taking to the stage together once final time.

He says: “I never really thought the six of us would be getting on a stage together as quickly as we have, it will be fun. It’s one year on and it gives another chance for ourselves and the audience just to reflect and experience it again. Like Stirling was, it’s a celebration.

“We’ve always had this wonderful relationship with the audience, it’s so vital to have that two-way experience, and it was a celebration for them as much as anything else. I really hope that comes across.”

He knows fans may go through the emotional wringer again, but he hopes for the right reasons. “I’d ask them enjoy this again. I hope what we’ve done, not just here but for 45 years, has meant something to them.”

Runrig, The Last Dance Premiere Tour, begins on Saturday at Glasgow Royal Concert Hall