"2. A Participating Company (other than the Company) shall cease to participate in the Plan if: (a) it shall give not less than one month's previous notice (or such shorter period of notice as the Trustee shall be willing to accept) in writing to the Trustee that it intends to cease to contribute to the Plan for any reason, or (b) … or (c) … and upon any such cessation of participation there shall be deemed to be a dissolution of such part of the Plan as the Trustee determines to be appropriate to the Participating Company and the provisions of Clauses 5.5 to 5.11 (application of Fund) shall (mutatis mutandis) apply to the partial dissolution."
"and upon any such cessation of participation there shall be deemed to be a dissolution of such part of the Plan as the Trustee determines to be appropriate to the Participating Company…."