Article 18U.K.Aggregation of periods of insurance, employment or residence
1.The competent institution of a Member State whose legislation makes the acquisition, retention or recovery of the right to benefits conditional upon the completion of periods of insurance, employment or residence shall, to the extent necessary, take account of periods of insurance, employment or residence completed under the legislation of any other Member State as if they were periods completed under the legislation which it administers.
2.The provisions of paragraph 1 shall apply to seasonal workers, even in respect of periods prior to any break in insurance exceeding the period allowed by the legislation of the competent State, provided, however, that the person concerned has not ceased to be insured for a period exceeding four months.