Anyone with similar setup might be interested in trying this.
Out of curiosity I connected my GC to newly purchased Panasonic DMR-EX87 1080p capable DVD/HDD Recorder via AV2 SCART input having previously connected console directly to the TV with so-so results.
Recorders AV2 input would normally be reserved for set-top boxes eg. sattelite/freeview.
GC's RGB output before then connected directly to HDTV looked poor in comparison with that found on my 9 year old 29" Mitsubishi.
Colours are now more vivid. I can now upscale GC output via HDMI output on DVD recorder to 1080i
Expensive upgrade I know. But I bought recorder originally to replace failing VHS recorder.
I am trully amazed by the positive results this made to GC's images.