Yes I tend to agree with that, airline was BA, stock photo was BA ! Would we be complaining if for example there was a story about "Starbucks", the story includes a stock photo of a Starbucks sign in London, yet the story is about a Starbucks in Birmingham, Eagle eyed or local people may spot that the photo was taken in London but 99.9% will not ! does it really matter anyway as the story was about a BA plane not a specific type of plane (other coffee shops available ..lol)
Well yes and no.
A more reasonable question would be why a journalist who, as the Daily Telegraph's Madrid Correspondent understandably doesn't claim any aviation knowledge, didn't just ask one of her sub-editors or spend 5 minutes on Google before filing her story.
At least then the penny might have dropped that BA fly several different types of aircraft and don't disgorge 450 passengers at a time at GIB. Or maybe even that the P-3 isn't an F/A-18 or a Typhoon.