Regulation 72 of the Public Contracts Regulations 2015 (PCR 2015), SI 2015/102 (SI 2015/102, reg 72) is aimed at clarifying the extent to which concluded public contracts may be amended without advertising a new tender process. The provisions concerning permitted modifications under SI 2015/102, reg 72, with the exception of the ground in SI 2015/102, reg 72(1)(a), do not expressly exclude the possibility of making modifications to a public contract which has been extended to the fullest extent provided for in the contract notice and in the contract documents. It is critical, however, that any modification made pursuant to SI 2015/102, reg 72 can be correctly justified by applying one of the grounds provided, some of which are considered below by way of example. SI 2015/102, reg 72(1)(a) provides: '(1) Contracts and framework agreements may be modified without a new procurement procedure