Corrupt systems can be noticed by the amount of praise their leaders get. When praising a leader is rewarded, people will praise them more. When a leader in a political system is praised so much, it doesn’t mean they deserve to be praised, it means people are rewarded when they praise the leader.
This disrupts the system’s error-correction mechanism. Political leaders correct their course based on feedback they get from the system. When admiring leaders is expected, that correction mechanism won’t function.
UPDATE 1:
There are numerous problems with the UK and other countries. I have been very critical of UK politics in many areas and will continue to criticize the UK government in the future, especially about environmental policies.
The issue is not that the UK or the US, etc are perfect countries, the issue is a willingness to self-correct and mechanisms that facilitate that. The question Iran should answer is whether it wants to self-correct and develop mechanisms to make that possible.