I dont think Scott is very close to Cameron. At first he didnt give Cam a chance (IMO. He used to say to Fed he couldnt see him keeping in touch with Cam and a few others) but also as he came to know Cameron more, I dont think he was that impressed. As mentioned, he used to call Cam the sly fox, and would say to Nush that Cam has his manly needs like all men

He nomd Cam in the last week and was pretty damning (saying he was surprised at Cams enthusiastic vitriol against Lisa etc).
I forgot Ray had African roots. And also, its a life-changing visit (with the ChristianAid part being humbling, and the BBAfrica bit probably being an exciting holiday too). I think Ray does genuinely likes Cameron too.
But its all speculation/rumour-mongering on my part, cos I dont have a clue why Scott didnt go