The Guardian children’s fiction prize was founded in 1967. It is awarded annually to fiction written for children aged eight and above, and is the only children’s fiction award selected by fellow writers.

Previous winners of the prize include Mark Haddon for The Curious Incident of the Dog in the Night-Time, Northern Lights by Philip Pullman, How I Live Now by Meg Rosoff, The Illustrated Mum by Jacqueline Wilson, Frank Cottrell Boyce with The Unforgotten Coat and last year’s winner Piers Torday with The Dark Wild.

The judging panel (made up this year of authors including previous winners Piers Torday and Jenny Valentine and one other author to be announced) will be chaired by Julia Eccleshare, Guardian children’s books editor. The longlist of eight authors will be announced in July (when the Young Critics Competition, where children review the books on the longlist for the Guardian children’s books site, will also be launched). The winner will be announced in December at a ceremony at the Guardian offices in London.

The deadline for submissions has now been extended to midnight Tuesday 28 April 2015 (with all books received by Friday 1 May 2015).

Eligible titles must be published between 1 August 2014 and 31 July 2015 and must have been published first in the UK. Previous winners are not eligible.

Please complete the following online form and then post a copy of the confirmation voucher and your submitted title to: Helen Woollison, The Guardian, 90 York Way, London N1 9GU to be received no later than midnight on Friday 1 May 2015.

If you have any questions email childrensfictionprize@guardian.co.uk