The audio versions of the three books in the Kingdom of Clockwork series are available from most audiobook distributors, including Mofibo, Audible, etc.
What reviewers say:
At times hilarious, and throughout with a great character voice and sense of progress.
I was very pleasantly surprised!
I listened to it as an audiobook. Billy O’Shea narrates it himself, and does a wonderful job at it, with sound effects in the background that made it feel like a massive production.
– Christoffer Dahl, Goodreads
You can hear extracts from the audiobooks here.