But through rousing renditions of hits including Elbow's One Day Like This and Bastille's Pompeii, as well as the moving final performance of the original song 'This is home', they stormed their way to victory, stealing the nation's hearts and shining the spotlight on mental health and isolation in the farming community in the process.
Farming Wales spoke to choir member Aled Griffiths, an NFU Cymru/NFU Mutual Group Secretary in Newtown who was one of several NFU and NFU Cymru members in the choir, to hear more about this once in a lifetime experience.
How does it feel to have been crowned winners of Britain's Got Talent?
'Surreal' is the best word to describe it. A little bit dream-like. Being the first choir to win Britain's Got Talent - a bunch of amateurs, a bunch of farmers - it's marvellous.
What were your expectations when you started out on this journey?
When I heard that they had entered us into Britain's Got Talent, I was thinking 'Wow, what's going on here?'. But then as soon as we got rehearsing, practising that Elbow song [One Day Like This], I thought 'Yes, this could work!'. But honestly, I didn't think that we would get further than the audition.
But to get that golden buzzer [which automatically sends the act through to the live semi-finals], it was just bonkers. We got through the semi-final, the momentum was building, and by that point, in the final, we'd really got nothing to lose. Let's go for it - and we got it! I still can't believe it, really.
Talk us through the experience of going through the competiton stages, the rehersals and what don't people watching at home don't see behind the scenes?
We didn't get an awfully long time to rehearse for Britain's Got Talent, really. When we did it was enjoyable because we got to know each other and started making friends with one another.
When we did the audition in Birmingham... it's a big process. Britain's Got Talent has a huge production team. Seeing all that, how it's made and everything was very interesting.
Then the London semi-final, that was sort of top gear really because it's a live show and the timings and everything else are critical. So it was very interesting to see all of that. Logistically it was a thing for us getting everyone down to London as it's obviously not that convenient from mid Wales and the other rural places people in the choir were coming from.
The travel could be tiring at some points, but in some respects it made it all the more enjoyable because we really bonded as a crew and got to know each other. I've really enjoyed all the interactions that we've had.
What was it like being part of that group?
I was very fortunate that my good friend, Aled Wyn Davies, from Llanbrynmair, was also in the choir. I've known him a really long time; I used to sing duets with him years ago in Young Farmers' Club. So that was a big help for me.
But there's no doubt that I've made very good lasting friendships with the other choir members, as well.
The Choir's story has received incredible coverage and rasied a lot of money and awareness for some important causes. Why were those causes important to the choir members?
Some of the prize money will be going to mental health charities and good causes supporting farming and the countryside. It's important to me and the rest of the choir that we've been able to promote these causes: mental health issues in farming and rural life, as well as drawing attention to isolation and also farm safety, which is just as important - farming is one of the most dangerous industries in the country.
Those things were talking points as we were getting to know one another. I think we all know somebody who's been affected. There are alarming tales of people that are just at their wits; end. Through my work as a Group Secretary I've got to know people over a long time and people have shared a lot of their problems with me over the years.
I hope that I've been able to help people with those problems, because a problem shared is always a problem halved. All the choir have their own personal stories and reasons that are important to them and hopefully we have helped people by bringing attention to these issues.
