WOLFF’S Law is a medical rule written by 19th century German anatomist Julius Wolff.

It states that a bone in a healthy person or animal will adapt to the weight it's placed under. Rather than growing weaker, if the load becomes too much, the bone will remodel itself to bear the weight.

Ritzy Bryan, the singer, guitarist and main songwriter (Rhydian Dafydd and Matt Thomas complete the line-up) stumbled across Wolff's Law while aimlessly trawling through pages on the internet one night. Suddenly she had a name for what she'd been feeling.

"It was just as we were releasing The Big Roar," she says, referring to the band's first album from January 2011. "The idea really struck a chord with me because there had been some degree of healing in a relationship in my life.

"My parents had been going through a long and drawn-out divorce. It was a sad time, things breaking down like that, but there had been small steps towards me reconciling with them. And that's when I saw Wolff's Law. It was very symbolic and made total sense to me."

The idea stuck in Bryan's mind, and lyrics started to flow. Wolf's Law (she dropped an 'f') was the first song, and subsequently gave the trio the title for their second album. It'll be released on January 21, the day before they begin a large UK tour.

The band, from Mold in North Wales, toured almost constantly in 2012, including a support slot with Muse in the US, meaning they should be in perfect shape for the UK dates.

The band did manage to find time in their touring schedule to record Wolf's Law.

"It was all so quick," says Bryan. " I just think we were eager to get back in the studio. We'd been writing on the road for 12 months, and when you've got all those ideas, you just want to find out what you have.

Much of the album concerns itself with the preciousness of time, inspired by the aforementioned divorce, and the death of her beloved grandfather.

The loss is reflected in their new song The Turnaround. Tendons is another personal song, the first time Bryan has written about her long-term relationship with bandmate Rhydian Thomas.

"Music has always been at the forefront of what we do, and us as people, but we have a relationship too. It's a tricky thing to balance, but he's my best friend.”

" Now we've got this tour coming, which I can't wait for.

The band are at Liverpool Kazamier on January 22, Leeds Cockpit and Manchester Ritz on February 25 and 28 and Sheffield Leadmill on March 2.