(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(2) A collaboration agreement must be in writing.
(3) A collaboration agreement may make different provision for different cases or circumstances.
(4) A collaboration agreement may be varied by a subsequent collaboration agreement.
(5) A collaboration agreement may be brought to an end by agreement between the parties to it; and section 23(6) or, as the case may be, section 23A(6) applies to an agreement under this subsection.
(6) If circumstances are such that one or more of the parties to a collaboration agreement would not, at a particular time, have power to enter into a collaboration agreement of that description (whether because of a failure to meet the requirements of section 22A(1) or (5) or otherwise) each person who does not have that power must cease to be a party to the agreement.