55.5  Termination by the Contractor

55.5.1  The Contractor may terminate this Agreement only if the Authority is in [material Default] of its obligation to pay undisputed Charges exceeding £[  ] (indexed) that is due and payable by the Authority under this Agreement by giving the Authority 90 days formal written notice specifying the breach and requiring its remedy.  The Contractor's right of termination under this Clause 55.5 shall not apply to non-payment of the Charges by the Authority where such non-payment is due to the Authority exercising its rights under Clause 18 (Recovery of Sums Due).

55.5.2  The Contractor shall not exercise, or purport to exercise, any right to terminate this Agreement (or accept any repudiation of this Agreement) except as expressly set out in this Agreement.