[X1Article 6 U.K. Aggregation of periods
Unless otherwise provided for by this Regulation, the competent institution of a Member State whose legislation makes:
the acquisition, retention, duration or recovery of the right to benefits,
the coverage by legislation,
or
the access to or the exemption from compulsory, optional continued or voluntary insurance,
conditional upon the completion of periods of insurance, employment, self-employment or residence shall, to the extent necessary, take into account periods of insurance, employment, self-employment or residence completed under the legislation of any other Member State as though they were periods completed under the legislation which it applies.]