LONDON–(BUSINESS WIRE)– TR-1: Standard form for notification of major holdings 1. Issuer Details ISIN GB0030026057 Issuer Name NEXT 15 GROUP PLC UK or Non-UK Issuer UK 2. Reason for Notification An acquisition or disposal of voting rights; An acquisition or disposal of financial instruments 3. Details of person subject to the notification obligation Name Aviva PLC City of registered office (if applicable) London Country of registered office (if applicable) United Kingdom 4. Details of the sh