Just got through recording the Billingsgate titles and they are quad, regardless of this post. They are not double stereo and have moments of definition. I believe they used the very early encoders. Germans do not lie on labels. We had plenty here is the USA who would stretch it, encoding mono like everest. These pan well in the scope and light the tate up fine.
I've aquired a copy of this. yes, it say's it's SQ encoded, but it is actually the same stereo mix as the european release. Very dodgy marketing.
I've also tested the other two 'so called' quad releases on this label. Both are stereo.
Time to remove them from the list i think.