I didn't doubt you for a minute! But you're absolutely right the corresponding tracks on the Apron Strings mp3 that I downloaded from MB21 (no longer available) are in good, clear stereo. So, as I suspected, the LP was probably released in mono though the original recordings were in stereo. Mind you it's what one would expect from German sourced tracks in the 60s. The question is where did the stereo versions on the Apron Strings tape originally come from.................? Sorry, not much help.
Oh and regarding the S in the cat no, I'm guessing the same convention was used by De Wolfe - DWLP as against DWSLP.