Two Scottish based writers have won Costa Book Awards and are in the running for the title of Book of the Year.

Kate Atkinson's A God in Ruins has won the Costa Novel Award, the second time in three years she has been awarded the prestigious annual prize.

Poet, writer and musician Don Paterson has won this year's Costa Poetry Award for his latest collection, 40 Sonnets.

Elsewhere in the series of prizes, Andrew Michael Hurley collects the Costa First Novel Award for The Loney.

Andrea Wulf has won the Costa Biography Award for The Invention of Nature: The Adventures of Alexander Von Humboldt, The Lost Hero of Science.

The Lie Tree, a Victorian murder mystery by children’s writer Frances Hardinge, has won the Costa Children’s Book Award.

Originally established in 1971 by Whitbread, Costa took over of the sponsorship of the book prize in 2006.

The five winning authors are now in the running for the 2015 Costa Book of the Year.

Atkinson won the Whitbread Book of the Year in 1995 for her debut novel, Behind the Scenes at the Museum

Paterson also won the poetry award 12 years ago.

Christopher Rogers, managing director of Costa, a coffee shop company, said: "The Costa Book Awards have an extraordinary track record of recognising and celebrating some of the best and most enjoyable British books.

"So it’s fantastic to be announcing another stellar collection of award winners which we know people will absolutely love reading.”

The five Costa Book Award winners, each of whom will receive £5,000, were selected from 638 entries.

The panel of judges is chaired by James Heneage, and includes Louise Doughty, Matt Haig, Penny Junor, Martyn Bedford and Julia Copus.

Since the introduction of the Book of the Year award in 1985, it has been won eleven times by a novel, five times by a first novel, six times by a biography, seven times by a collection of poetry and once by a children’s book.

The 2014 Costa Book of the Year was H is for Hawk by writer Helen Macdonald.

Of Ms Atkinson's book, the judges said it was "Utterly magnificent and in a class of its own. A genius book."

Kate Atkinson won the Whitbread (now Costa) Book of the Year in 1995 with her first novel, Behind the Scenes at the Museum. Her novels featuring former detective Jackson Brodie became the BBC television series Case Histories, starring Jason Isaacs.

Her last novel, Life After Life, was the winner of the 2013 Costa Novel Award and the South Bank Sky Arts Literature Prize

Paterson has won many awards.

His poetry has won many awards, including the Whitbread Poetry Award (2003), the Geoffrey Faber Memorial Prize, the Forward Prizes and he is currently the only poet to have won the TS Eliot Prize twice.