I know one thing and that is to try not to use cheap scart leads they have caused me no end of grief in the past.....i then splashed out on some expensive ones and i dont suffer with any problems anymore.I suppose the same could be said for scart junction boxes too.Is it possible to get rid of the junction box and say connect dvd to vcr then out of vcr into the sky box then from sky box to the tv.So when you switch either dvd,vcr or sky box on then thats what will appear on the tv.Good luck.