Thanks guys for your time, but no not the right one (though I agree it sounds similar)
The HAPS report was compiled in the early 90s (maybe late 80s) by the CAA and Westland (and presumably some operator input) to determine ideal take off and landing profiles for the various types operating offshore. I think Westland developed a program into which type data could be entered and an procedure derived. The term 'HAPS modelling' is often used to describe this.
Anyone from Westland out there?