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Instead, communication occurred through older technology deemed more secure, like cable phones, or via trusted intermediaries, all in an effort to minimise the risk of interception or detection.

Many have taken to walking their dogs in secluded areas at night or driving them around to evade detection.

According to its website - which has since been shut down - it sold technical equipment to militaries, governments and police forces throughout the world, including equipment for drug detection.

Mrs Justice Cheema-Grubb said there was no evidence Ojiri supported any form of extremism but that his conduct undermined the detection of terrorist financing.

These may include facial detection software which estimates a user's age.