Watch Rollermania: Britain's Biggest Boy Band (2015) Official Trailer

In 1975, The Bay City Rollers were on the brink of global superstardom. The most successful chart act in the UK with a unique look and sound were about to become the biggest thing since the Beatles. Featuring interviews with Les McKeown and other members of the classic Bay City Roller line-up, and using previously unseen footage shot by members of the band and its entourage, this is the tale of five lads from Edinburgh who became the world's first international teen idols and turned the whole world tartan.