Even in Delia's course - she has a good reputation for testing & refining etc. over time, not a TV personality with questionable time/skill in kitchen - the photos & making of those dishes to photograph are credited to someone else.

(And sometimes they do clearly vary from the recipe - like clearly not the called-for cheese, or without the described scattering of something over the top or whatever. Which I think's mostly fine or even good, but occasionally I think 'what do you mean by x' and either can't tell from the photo, or have to remind myself that that's only someone else's interpretation anyway.)