Will this be obtainable or purchase-able without having to buy the full game on GOG?

Reason is, I am getting the collectors edition from game uk because gog don't do physical editions....

Or maybe GOG will make an exception and give the comic to collectors edition buyers since they are already laying out 250 quid! but tbh i don't mind paying for it, as long as i can buy it by itself and not have to buy stuff i already will have.

It's going to be a digital download. I would assume they are printing a hard copy as well. And I know I will end up buying that anyway, even when I have that digital copy. So fingers crossed, let's hope for a physical comic book.

The physical editions come with a GOG code. You'll get everything which is advertised on GOG.com when buying the physical game.

https://twitter.com/GOGcom/status/1317134681159204865

awesome :) thanks for letting me know!