1 The information contained in this Presentation is confidential information as per your terms and conditions with British Telecommunications plc (BT). Please treat it accordingly and do not forward, republish or permit unauthorized access. BT reserves the right to make changes to the information in this Presentation at any time without further notice. BTW Planned Engineering Works Overview May 2015 to August 2015 These dates are indicative dates only and not to be used for any forecasting purposes as they are all subject to change. Please ensure that you wait for formal notifications from IRAMS.

2 Customer Service / BTID Network Change - Executive Summary IPv6 enablement on existing core / metro devices is ongoing. There is no planned customer impact as a result of this work. Trials have now commenced. MSE progress. There are now more than 4.28 million BB EU supported on 674 MSE. 2015/16 target has now been agreed as 8.7million EU on 800 MSE. Core P router replacement project is progressing well. This project will be transparent to the customers and CP. Driver for this replacement project is platform scaling. MSPE software upgrades will commence in with FOA in early June. The main upgrade programme will commence on 30 June. There is no planned impact on customer service. MSAN upgrades – The primary vendor MSANs are due to commence a software upgrade programme. This will commence in June and further details will be shared in due course. Customer Service / BTID Network Change - Executive Summary Q1 change volumes are currently running at an average of 183 PEWs per week and this is within the BT target volume of 248 per week. Q1 Network Change success rates are at 99.91%, which is at best in industry levels on the Quest industry measures. There were two customer impacting PEW failures in the last reporting week from 2027 network activities (PEW & PTW). Other Core / Metro Network Change Updates

21C Upgrades Prog No: UpgradeKey DriversUpgrades Complete / Total EUs per upgrade Upgrades per PEW Affected Products Av. End user outage (Mins) Upgrade s per week Progress Planned End May June July Aug SVLAN moves Capacity, Stability OngoingAv 800 Min 0 Max WBC35Up to 75 Ongoing EEA / EES / MSE / MSC Upgrade Features (Ipv6), Vendor Support 1822/2315Av HE, WBC, WBMC July 15 P router replacement Platform evolution 83/212No Impact1None 1 April 16 6 SVLAN moves - these moves offload SVLAN’s (bundles of Broadband traffic) from one BRAS to another. This is carried out to alleviate capacity issues mplet Required to support IPv6 and due to current software going end of support 45 Replaces all P routers in core of 21c platform. No impact to end user due to resilience in platform 51

4 Ongoing 20C Upgrades Prog No: UpgradeKey DriversUpgrades Complete / Total EUs per upgrade Upgrades per PEW Affected Products Av. End user outage (Mins) Upgrad es per week Progress Planned End May June July Augl DSLAM SDH Bypass (MSIP Closure) MSIP Platform Closure 4949/ IPSC1060 May 15 46

5 Completed 20C Upgrades Progr No: UpgradeKey Drivers Upgrades Complete / Total BB EUs and/or Ethernet Circuits per upgrade Affected Product s Av. End user outage (Mins) Upgrade s per week Date Ende d BRAS 12.3 EoL225/225Av Min 3000 Max IPSC208May 14 44

6 Completed 21C Upgrades Progr No: UpgradeKey Drivers Upgrade s Complet e / Total BB EUs and/or Ethernet Circuits per upgrade Upgrad es per PEW Affecte d Product s Av. End user outage (Mins) Upgrades per week Date Ended BEA-VS Software Upgrade Stability20/20Av 300K1WBC / WBMC / WCC Sub- second 1 Jan 15 High Throughput BEA-VS Capacity20/20Av 300K1WBC / WCC 45 mins1 Jun e

Broadband Services on 21CN

8 Ethernet Service on 21CN

9 Descriptions