I recall, and please correct me if I am wrong, the IOM 08 ILs was put in as direct result of a UK CAA report into two (same day)seperate incidents of HS748 aircraft on Vor 08, early morning approaches, in fog.
These Vor approaches were to say the least "creative" as flow by the UK Atpl rated pilots, as to heights flown and at what points of the approach these heights were achieved. They were lucky.
This report makes a chilling read, and a valuable lesson in DME orientation.
The IOM and uk Caa are to be congratulated IMHO for sorting this approach situation out in under 18 months by putting in an ILs.and seeing if their legally fatigued pilots can follow that.