Do you really believe that most people thought the UK and others "didn't" have boots on the ground, either as intel gatherers OR as ex soldiers paid for and controlled by the UK Gov't / MOD "representing Britain", which is only one step removed from sending signed up troops anyway.
And did you really think that countries wouldn't try to supply weapons to the rebels including China, South Africa (photo evidence of SA weapons). Gun making and selling is a business and wars are the best time to sell.
I'm only highlighting the lies told by Politicians and their abusive of international law when it suits their interests.
In which case why would Iran or anybody else trust a Western country with their history of lying and interfering in countries to obtain trade benefits.