Holy Spider now down to £10.99 on HMV.
However looks like the US Blu-ray has more extras as in addition to the Abbasi/Amirpour Q&A it features:
Q&A with moderator Reza Safai at Laemmle Town Center
Q&A at IFC Center with Ali Abbasi
Interviews with Ali Abbasi, Jacob Jarek, Mehdi Bajestani, Sol Bondy and Zar Amir-Ebrahimi