Spotters: Which MkIV Lightweight in CAR Nov 1992?

[SunDude]

The November 1992 issue of CAR magazine featured the following article about the Autokraft MkIV Lightweight.
   
   The test car wears UK registration plate J955 SPH.  Can anyone identify which chassis number it is?
   
   This particular car was also featured in several other articles by other magazines back in the day.
   
   
   
   
   
   
   Photos hotlinked from Flickr