Dianne Jennings of the AGS (Association for Geotechnical and Geoenvironmental Specialists) is the person to contact:-
They have just produced a new guide entitled "Selection of Geotechnical Soil Laboratory Testing" this is as an adjunct to the British Standards for carrying out Geotechnical tests (BS 1377, dated 1990)
The guide is in two parts
Part 1 - principles and context of soil testing
Part 2 - general design principles for geotechnical processes