You will note that this is the ONLY let down procedure approved by the Company and the CAA
Seeing as you emphasise the "ONLY", the company approved let down had in fact never been used. You've used the excuse prior that that was because the weather was severe VFR. By what company directive were they enabled to descend to the company advertised "see Antarctica from 2,000 feet". The advertised 2,000 rather puts the contention that 6,000 was the limit in some doubt.