NORTHERN GAS NETWORKS FINANCE PLC – XS0234964459
The evidence I’ve located defines these as bonds. On that basis, the instruments would fall under the definition of a ‘security’ for ISA purposes. The ISA criteria for securities is that the security itself or the shares in the issuing company are either listed on a recognised stock exchange or admitted to trading on a recognised stock exchange in the EEA including the UK.
The security (bonds) are traded/listed on the main market of the London Stock Exchange (link below) so these bonds will be ISA qualifying.
NORTHERN GAS NETWORKS FINANCE PLC 90JH Stock | London Stock Exchange