Ciaran, we have three Senecio sightings for Top Hut TSR on NatureMapr. There is this one, and also Sightings 4662083 and 4683502. One is unresolved, and the other is S. quad. Would you possibly have the time to check them out and let us know if we have three different species there please?
BTW, Sighting 4621023 just caught my eye, and it is B. glauca. Top Hut is pretty much the only place I have seen it growing in grassy patches.