Heliport
And what his passenger does with the pics is no concern of the pilot's.
I am not a lawyer but I think you are right - no way the pilot could get done just because a passenger took some pics and sold them afterwards. He's an unwitting accomplice. However if the CAA established the pilot knew in advance of the commercial element, they would succeed in making the whole thing look like aerial work. And you bet they would go for it; they aggressively prosecute anything where they should get the AOC fee.
A big bizjet, say £50M, can be flown single pilot on a PPL/IR and you could cost share it. (The IR is required for a JET because outside the airways the fuel consumption is silly and because nobody will train the Type Rating unless the applicant already has an IR - believe it or not, people have bought jets and discovered this later).
Re the 747 business, you are right that a 747 can be flown on a PPL, though a 747 is not single pilot certified and I wonder how the need for two pilots would impact the PPL Cost Sharing rule
I imagine J Travolta has a CPL/IR and takes someone along. But he can fly the Gulfstream single pilot.