Niall’s been swamped, between the Strange Horizon fund-raising drive and travel, so while his posts are Farthing are still forthcoming, I can’t say when.
In the meantime, there’s some news on the subject of the book’s availability in the UK! Regardless of why it may or may not have been unpublished in the UK before now, Jo Walton has now sold world English rights for the book to Tor. The major immediate impact of this is that the audio book version of Farthing is now available in the UK (from Audible or wherever else you choose to buy it from).