Danscowpie - no I'm afraid you're wrong re unpaid fees.

The AAIB report will be published before too long and I anticipate will make some interesting reading.

Why would there be an AIB report, there was no accident?

Serious incident

Not true. Either the CAA or an 'authorised person' has, in specified circumstances, the power to prevent an aircraft from flying and to detain that aircraft without any prior court order. All CAA inspectors, for example, carry a warrant conferring such powers. ANO Articles 232 and 233 refer.

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.