I guess it would be far too simple to make stuff that just works.....This may solve your problem:
Doctor HDMI solves problems related to HDMI such as compatibility problems: Amazon.co.uk: PC & Video Games
Doctor HDMI solves problems related to HDMI such as compatibility problems: Amazon.co.uk: PC & Video Gameswww.amazon.co.uk
Thanks, but throwing sixty quid at this problem seems excessive.That suggests to me that your new Sky Q box is looking for a later version of HDCP which your older projector does not support…