Interestingly, the UK is slightly ambiguous on the situation described in the Avweb article. For those that have not read the link, it is discussing the specific case of a radio failure in VMC conditions within Class A airspace, where the flight to a suitable landing site can be completed wholly in VMC conditions.
In the US, (something I didn't actually know) is that if you have a radio failure in Class A and can divert to a suitable landing point in VMC, you SHALL (i.e. you must) proceed VFR to such destination, hence you abandon the traditional IFR follow the 'flightplan/last clearance/expected clearance,Minimum Levels' process and fly a VFR descent in Class A and then onto a suitable airport.
In the UK, this is also provided for (so the answer is Yes you can in this very special circumstance fly VFR in Class A in the UK just like you do in the US). HOWEVER, earlier in EN 1.1 3.4.2.2.4 it says you should ONLY do this if there is a overriding safety reason. So even if you are in VMC, not a cloud in the sky and above a beautifully suitable airfield, ATC expect you will follow the IMC lost communication procedure.
3.4.2.2.4 For the purposes of these procedures, ATC will expect an IFR flight following the ATS route structure to adopt the IMC
procedure in paragraph 3.4.2.4. If there is an overriding safety reason, the pilot may adopt the VMC procedure.