It is my impression also, however I have no idea if there is a "CODE of CONDUCT" for captured British military or even if the one we knew existed......indeed exists today in our military.
Someone out there in FR land should know.
(US) Code of Conduct In-Depth
October 7, 2005
AR 350–30
Code of Conduct, Survival, Evasion, Resistance, and Escape (SERE) Training
This revision—
o Adds responsibilities for maintaining records for levels B and C SERE
training and for matters pertaining to U. S. military personnel in detention,
hostage, or captivity situations (chap 1).Level B training and procedures
have been changed for maintaining records for levels A, B, and c (paras 3-5 and
3-6).
o Implements DOD Directive 1300.7 which changes the training guidance for Code
of Conduct training (chap 4) to coincide with DOD Directive 1300.7, December
1984.
o Adds chapter 5 to provide guidance for soldiers in captive, hostage, or
detention situations.
http://72.14.203.104/search?q=cache:OMVqhU5jHfsJ:www.fas.org/irp/doddir/army/ar350-30.pdf+AR+350-30&hl=en&ct=clnk&cd=3&gl=us&client=firefox-a