Paragraph 4 Restriction on membership
No person shall be treated as a member of more than one political group at any given time and, accordingly, if a person changes the political group of which he is a member by a notice under paragraph 1 or 2 he shall from the date of delivery of that notice be treated—
(a)
in the case of a notice under paragraph 1, as a member only of the new political group which is constituted in accordance with that paragraph; and
(b)
in the case of a notice under paragraph 2(b) as a member only of the group named in the notice.