survivorship) pursuant to the terms of any pension scheme in which DCL or any Replacement Supplier is not then participating, or pursuant to the Future Transferring Employee's terms and conditions of employment prior to Termination Date. 21. Step in rights 21.1 If SEV fails to provide part or all of the Maintenance Services in accordance with this Agreement in any material respect. DCL may notify SEV that it intends to exercise its rights under this Clause 21. DCL agrees that it shall provide SEV with notice of its intention to exercise this Clause and shall provide SEV with a reasonable opportunity to rectify the failure to provide Maintenance Services to the satisfaction of Dairy Crest. 21.2 DCL shall notify SEV of the reasonable costs to be incurred by DCL in the event that this Clause 21 is exercised by DCL. 21.3 If SEV does not substantially remedy the failure within a reasonable period of the notice referred to in Clause 21.1 (not to exceed 15 days), DCL may itself provide or may employ and pay a third party supplier to provide the Maintenance Services or any part of the Maintenance Services. DCL's reasonable costs in doing this may, at DCL's option, be deducted from any sums due to the SEV or shall be recoverable from SEV by DCL as a debt. 21.4 To the extent to which the Maintenance Services are being provided by DCL or a third party supplier under Clause 21.3, SEV will be relieved of its obligations to provide the Maintenance Services. SEV will not be liable for the acts or omissions of DCL or the third party supplier in providing the Maintenance Services. 21.5 DCL shall permit SEV to resume delivery of the Maintenance Services once it is satisfied on reasonable grounds that SEV will be