I don't think that every RNAV waypoint is based upon a ground-based aid, that's the whole point. However, if you look at a low level airways map of the UK for example, you can often work them out from there.
E.g: SAPCO Lat and Long: N52.34.4 W01.21.4, but also TNT 163/33
However, CHELT N51.52.1 W02.22.9 seems to have no aids upon which to cross-reference.
By the way, I think you need to revisit your DOLAS measurement. 43nm is far to short. 143nm might be better!