No, it doesn't show that you can use them.Sorry dont know why it posted 3 times...but this shows you can use SRCD's This was taken from the NICEIC magazine
It expresses the NICEIC's (or someone therein's) opinion.
However if you actually go to BS 7288 the current Standard CLEARLY states that these devices CANNOT be used to provide additional protection. I do not believe that a future Amendment to BS 7671:2018 is set to permit these devices. (Otherwise they could have included it in Amendment 1 quite easily, which was published in February.)