I'm pretty sure these cables are directional - and that ones the wrong way round - ie scart to the phonos.
I purchased at the weekend a QED AV29-10 (1m version), which is 6 Phonos to Scart - quality is very good indeed and it works perfectly from my Pioneer 656 to My Loewe Vitros. Both component modes (YUV Syn on CVBS and YUV Sync on Y) work.
I realise this cable is not the cheapest, but I bought it as it most people seemed to think it was compatible.