Brooke, 35, said being in the choir had given him “extra support” in his job, which could be “very lonely and isolating”.
After the win, the choir celebrated at a pub in London, where they were joined by Clarkson and one of the ITV talent show’s judges, Amanda Holden.
“It’s been a bit of a whirlwind,” said Brooke.
“I was saying to my wife earlier that actually, I’m quite looking forward to coming home.
“It’s all well and good, but you know, the thing that I actually love is farming, not that I don’t love singing.”
Brooke had been unsure about joining the choir.
He had felt out of his comfort zone in the rehearsals, having only ever “sung to my daughter”.
It was his wife who replied to an advert for singers for a farmers’ choir. Brooke was chosen and given a baritone-bass role.