Rules depend...
On where you are...
Moscow Rules for intelligence operatives and others...
Assume nothing.
Never go against your gut.
Everyone is potentially under opposition control.
Do not look back; you are never completely alone.
Go with the flow, blend in.
Vary your pattern and stay within your cover.
Lull them into a sense of complacency.
Do not harass the opposition.
Pick the time and place for action.
Keep your options open.
London Rules are...more permissive, lower threat theater, and more applicable to much higher level 'players'...
Lower Threat Environment: Applicable to environments like London, where the level of risk is significantly lower.
More Flexibility: Allows for more freedom of movement, communication, and interaction. Also known as CYA...
Less Rigidity: Operatives can take greater risks and deviate from strict protocols. Getting doubled/tripled is not unusual depending on the type of blackmail used and by whom...
Different Operational Focus: Shifting from survival to achieving specific objectives within a less dangerous context. See also- CYA to protect your ass from taking ANY blame for anything...
As they say, different strokes for different folks...
Given the current politics in the UK how much lower of a threat environment is London?