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Limit on duration of licence. 
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90.—(1) Subject to subsection (2), where an activity to which a licence or revised licence under this Part relates— 
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(a) has not commenced within three years after the date on which the licence or revised licence was granted, or 
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(b) has ceased for a period of not less than three years, 
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the licence or revised licence shall cease to have effect. 
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(2) Without prejudice to subsection (1), the Agency may, having regard to the nature of the works and arrangements necessary in connection with the activity and any other relevant consideration— 
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(a) specify a period being a period of more than three years during which the licence or revised licence is to have effect, 
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(b) on an application which complies with the requirements (if any) which may be prescribed, extend the period so specified. 
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