Report is out from AAIB.
Air Accidents Investigation: Socata TBM 850, N850TV
I read it as: pilot selected wrong frequency, assumed loss comm, continued approach and landing as entitled to do in line with regulations. ATC didn't expect this (having previously been told to expect a Go Around in such circumstances) and had lined up departing traffic.
4 recommendations (and 1 clarification of tax issues) came out of this incident - something I think tells you how serious it is. It appears no-one did anything wrong, but something potentially very dangerous happened... system change required.