Got a Sony Xperia Z (C660X) phone? If you have, we’ve been pointed to this app on the Google Play Store that seems happy to give you a £20 voucher code (via email) for the PlayStation Store.
Not having such a phone I can’t test it, and your mileage may vary (some say it’s just for Music Unlimited) but it’s probably worth a shot, given that the app is free.
Yes, it’s there just to promote Sony’s services for that specific phone, but if they’re going to give you enough for The Unfinished Swan (with £15 change) then who’s to argue?
If you try it, let us know if it works. And what you buy with the voucher.