Just had a browse through this month's AAIB collection of misfortunes.....
http://www.aaib.dft.gov.uk/bulletin/apr03/n961jm.htm
I had never realised that Dunkeswell was licensed for Cat 3 approach procedures in fog, or had reflective plates added along the runway? Is this a CAA approved addition to a licensed airfield?
I thought this AAIB comment was a bit of an understatement:
The investigation concluded that the accident had occurred due to an attempt to land at night in fog, at an airfield with no runway lighting and only limited cultural lighting to provide visual orientation; these visual references were lost when the fog was entered.