This is a contract result notice, not an open opportunity. Details from the official award data.

Original contract value uplifted from (£9,227,395 Excluding VAT) to (£13,841,09 Excluding VAT) following modification under PCR Reg 72 (1) b for additional works, services or supplies by the original contractor that have become necessary and were not included in the initial procurement, where a change of contractor: Reasons (i) cannot be made for economic or technical reasons such as requirements of interchangeability or interoperability with existing equipment, services or installations procured under the initial procurement, and (ii) would cause significant inconvenience or substantial duplication of costs for the contracting authority, provided that any increase in price does not exceed 50% of the value of the original contract;"