What are the rules/grounds for modification under Public Contracts Regulations 2015? There are specific rules relating to modification and termination of public contracts under the Public Contracts Regulations 2015, SI 2015/102 (PCR 2015, SI 2015/102). PCR 2015, SI 2015/102, reg 72 sets out clear rules in relation to modification of public contracts and establishes permissible grounds for modification and these are stated at PCR 2015, SI 2015/102, reg 72(1)(b)–(f). Modifications which fall outside these permissible grounds will require a new procurement procedure in accordance with PCR 2015, SI 2015/102. What are the relevant permissible grounds for modification of a public contract under PCR 2015 that require a modification notice to be published? As stated above, the permissible grounds for modification are set out in PCR 2015, SI 2015/102, reg 72(1)(b)–(f). Under PCR 2015, SI 2015/102, reg 72(3) contracting authorities which have modified a contract under the permissible grounds described in PCR 2015, SI 2015/102,