I had based the design on the classic Penguin Books style and it seemed to work. Folks on Twitter have always shown their appreciation on the look. But it was one of the first mock covers I'd attempted in Photoshop and I certainly no longer had the original layered file on any of my current drives.
So this new version has been created from scratch and includes a back cover more in tune with BBC DVD releases. It even includes the actual bar code from the commerical version!