The album, which features the upright bass playing of Ash Johnson, also incorporated Perring's playing once more, alongside guest performances from Simon Edwards on psaltery, drummer Phillip Harper and the singer Melanie Pappenheim.
It was released on 08/07/2013 and has been highly praised.
Paul Sexton of BBC Radio 2 said 'Phosphor is an excellent album...' Soundblab awarded Phosphor 10 out of 10, calling it 'one of the finest alternative albums so far this year.'.
The Italian website Ondarock.com also lauded Phosphor, saying 'Phosphor is a valuable antidote to the poverty of inspiration and courage of many heroes of the indie singer-songwriter genre.'Culley's fourth album Stripling was released on 27 April 2015.
R2 (Rock'n'Reel) awarded Stripling four out of five stars, and compared Culley to Tim Buckley and John Martyn.1 September 2018 saw the release of Culley's 5th album 'Last!'.