406. Variation and revocation of licences.

406.     Variation and revocation of licences.

The Secretary of State1 may vary or revoke any exploration2 or exploitation licence3 where the variation or revocation is in his opinion required (1) to ensure the safety, health or welfare of persons engaged in any of the licensed operations4 or ancillary operations5; or (2) to protect any marine creatures, plants or other organisms or their habitat6; or (3) in pursuance of foreign discriminatory action7; or (4) to avoid a conflict with any obligation of the United Kingdom arising out of any international