The UK audiobook version of Blood Song is now available for pre-order at Audible.co.uk: http://www.audible.co.uk/pd/Sci-Fi-Fantasy/Blood-Song-Audiobook/B00KIY6CSM/ref=a_search_c4_1_2_srTtl?qid=1400922272&sr=1-2

As stated below, the audiobook will be released on 12th June. I have since confirmed with my UK publisher it will also be available in Australia, New Zealand, South Africa and Ireland.