WH
That happened right up until 1993 when Channel 4 had to start selling its own advertising and paying for itself. All Channel 4 bulletins would end with something like "That's it for now. The next news from ITN is at 5:45 on ITV". Although I think ITV did away with this during the 80s and just had a caption on the ITN endcap.
Whataday
Founding member
As mentioned, in those days C4 was very much ITV2 and hence Channel 4 News would be plugged at the end of the News at 5.45 and Channel 4 News would plug News at Ten.
That happened right up until 1993 when Channel 4 had to start selling its own advertising and paying for itself. All Channel 4 bulletins would end with something like "That's it for now. The next news from ITN is at 5:45 on ITV". Although I think ITV did away with this during the 80s and just had a caption on the ITN endcap.