I doubt they would scan a whole new transfer without DNR just to show it on television. It would be so much easier to just use the same blu-ray master.
That is true, however alternate or older masters frequently turn up during TV airings. This is exactly what happened recently with broadcasts of Predator and Psycho. I suspect it also might be the case with the ITV broadcast.
Here’s a comparison of the same shot from a Blu-ray rip and the ITV airing. Note that the former suffers from horizontal and vertical cropping whilst the latter has a more visible area and lacks the “Coming Summer 1990” title that is present on the Blu-ray and DVD.