Red a while ago conformed to max 0.2% sulphur, but was reduced to 0.1% max. It's specification is lower in overall quality, that is in moisture content, sulphur level, cetane number / index and particulates just as examples.
ULSD (Road diesel as some of you call it ...) is 10ppm Sulphur with higher specs on Cetane etc.
There is no reason why your RR shouldn't run on Red ... and you shouldn't have to change filters more often than normal - as normally a filter will not be anywhere near clogged at service interval.
I can say that I have no trouble running filters on my Perkins boat engine for couple of years on cr*p diesel that I blend for personal use ... average particulate in my 'home blend' is 10x Red upper max limit !
I would not use Red in high performance engine though - doubt it would do harm, but would expect any inspection of the engine in event of failure to show the use of lower quality fuel....
For peeps interest - plan is that lower quality Red will be phased out and basically a single grade diesel be offered to retail / non industrial buyers. The other planned phase is the reduction of Sulphur to near zero as well ... so TBH - all the worries today are nothing compared to whats coming ...