... on the other hand, I would expect journalists even on local papers to be pretty much on the ball as regard issues of fact such as times etc. The article in the OP doesn't name the journalist concerned but does say he - it was almost certainly a he - was a senior reporter.
Interestingly if you look at the BBC article the newspaper itself seem a bit bemused by this:
'"It would have been common knowledge in the office who took the call, but we have nothing in our archive - we have nobody here who knows the name of the person who took the call," she said.
In a video posted on the newspaper's website, chief reporter Chris Elliott, said "no one has ever been able to establish whether that call was actually made" but the fact that it might have been made came to light in the 1980s.'
http://www.bbc.co.uk/news/uk-england-cambridgeshire-41773716It seems odd to me that there is no recollection from the newspaper of this incident - surely if this had happened it would have been all over the newsroom floor - spreading like wildfire that 'Joe Bloggs' - senior reporter - had received this bizarre phone call and less than an hour later they were getting reports of the shooting. It seems strange that although the FBI apparently knew all about this just 4 days later it doesn't seem to have developed any credence in the newspaper itself until 2 decades later.
All I can say is Grenfell baby story.