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The Home Office Guidance describes the Tier 1 Exceptional Talent visa across the whole range of industries, such as Arts, Science, Technology &c. The version that was available at the time I applied was 01/2018, but the current version is 11/2018 which just adds the consideration factors. Those factors make sense for the previous version as well. Although the guidance is asking to meet "at least" one key and two qualifying criterion (p. 34), it also says "or" (p. 38) — moreover, the younoodle.com platform where the application is made says: "Which key and qualifying criteria are you applying for? Please choose one key criteria and two qualifying". Therefore, it is not necessary to meet both of the key criteria.
Exceptional Promise criteria for applicants who (pp. 8, 35-36):
When assessing your application, Tech Nation will take into consideration (p. 40):
Applicants must meet at least one of the key, and at least two of the qualifying, criteria (p. 34).
In meeting these criteria, you must demonstrate proven commercial or technical expertise in building, using, deploying or exploiting a technology stack and building technical infrastructure (p. 35).
Provide two or more examples of innovation in the digital technology sector as a founder of a digital technology sector company or an employee working in a new digital field or concept that must be clearly evidenced (p. 38).
Proof of recognition for work outside your immediate occupation that has contributed to the advancement of the sector (e.g. evidence that you have gone beyond your day to day profession to engage in an activity that contributes to the advancement of the sector)(p. 38).
Have been recognised as having the potential to be a leading talent in the digital technology sector (p. 40)
Have undergone continuous learning / mastery of new digital skills (commercial or technical) throughout your career (p. 40).