If the Trust enters into an agreement in accordance with section 20 that relates, or agreements in accordance with that section that together relate, to rights, property or assets of the Trust in relation to both of the Markets managed and controlled by the Trust, the Minister shall, as soon after the day referred to in section 20 as it appears to him to be appropriate to do so, by notice published in the Gazette , fix a day on which the Trust is to cease to exist.