it looks like these are 3 different persons:

Robert Laing, Art Director

Bob Laing, British art director: Ghandi (Oscar?) (Encyclopædia Britannica)

Robert Liang, (The Boys in Company C)

Doctor and the Devils: (credits confirmation?)
Robert Laing: Set Designer
Bob Laing: Production Designer

Ghandi: (credits confirmation?)
Production Designer: Robert Laing
Art Director: Bob Laing

Invelos TLC action on one common name? no research on this person or persons?
Rules of Engagement: February 13, 2008
Robert W. Laing is credited in the following 40 titles (93 profiles)
Robert Laing is credited in the following 19 titles (62 profiles)

True Lies (1994): May 31, 2008
CLT: Robert W. Laing 41 titles/93 profiles
      Robert Laing 23 titles/69 profiles
November 25, 2007
use "Credit Look up" for Robert W. Laing (40 to 19 titles)

(James Clavell's) Noble House: March 27, 2008
Common name used for:
Robert W. Laing (CLT has 41 titles, 92 profiles)

Live And Let Die: December 2, 2007
Removed Art Director: Robert W. Laing (Co-Art D)

Bob Laing Movies:
Carry on Constable (1960) ????
Escape From The Dark (1976) Art Director
First Knight (1995) Art Director
Frenzy (1972) Art Director
Gandhi (1982) Art Director
On Her Majesty's Secret Service (1969) Art Director
Shout at the Devil (1976) Art Director
Sorcerer (1977) Set Decorator (No DVD profiler credit: Set Decorator)
Titanic (1997) Art Director

Robert Laing Movies:
Carry on Regardless (1961) ????
Doctor and the Devils (1985) Production Designer
Fire, Ice and Dynamite (1991) Production Designer
Gold (1974) Art Director
Great Gatsby (1974) Art Director
High Road to China (1983) Production Designer
Mister Moses (1965) Assistant Art Director (No DVD profiler credit: Assistant Art D)
Neverending Story II: The Next Chapter (1991) Production Designer
Night Games (1980) Production Designer
Perfect Friday (1970) Art Director
Rollerball (1975) Art Director
Rules of Engagement (2000) Production Designer
Travels With My Aunt (1972) Art Director
True Lies (1994) Art Director

Robert Liang Movies:
The Boys in Company C (1977) Production Designer
Munyurangabo (2007 ) Executive Producer

Non of the above is yet confirmed, there just claims