You can have the in race chat as long as it is not towards the business end of the race.
As previously mentioned, CH4 with Oaksey/Francome used to do it regularly but it was always at a point where there was a natural lull in the race (at Kempton it was often between the last fence going away from the stands around to the first fence down the side and at Sandown it was often after they jumped the last on the first circuit all the way down to the first fence as they turned down the back and sometimes extended to just before the Railway Fences).
I like Ruby as he isn’t shy of voicing a comment (outside of when he is asked about Mullins horses, where he is more tight lipped/non-committal) and his analysts from the booth section to me is always very informative (maybe not quite so much to the more experienced fans of the sport but certainly for newer viewers). He is so much more watchable than Mick Fitz and AP imho.