Publication of Suppl.Prospcts

British Telecommunications public limited company

13 November 2017

Publication of Supplement updating Existing Euro Medium Term Note Programme

The following Supplement has been approved by the UK Listing Authority and is available for viewing:

Supplement dated 13 November 2017 (the "Supplement") supplementing the Prospectus dated 16 June 2017 relating to the U.S.$15,000,000,000 Euro Medium Term Note Programme of British Telecommunications public limited company ("BT").

The Supplement incorporates by reference BT's results for the half year to 30 September 2017.

To view the Supplement in full, please paste the following URL into the address bar of your browser:

http://www.rns-pdf.londonstockexchange.com/rns/3569W_-2017-11-13.pdf

A copy of the Supplement will be submitted to the National Storage Mechanism and will be available shortly for inspection at: http://www.morningstar.co.uk/uk/NSM.

For further information, please contact:

BT Investor Relations

Tel: +44 20 7356 4909

E-mail: ir@bt.com

DISCLAIMER - INTENDED ADDRESSEES

Please note that the information contained in the Supplement may be addressed to and/or targeted at persons who are residents of particular countries (specified in the Prospectus) only and is not intended for use and should not be relied upon by any person outside these countries and/or to whom the offer contained in the Prospectus is not addressed. Prior to relying on the information contained in the Supplement you must ascertain from the Prospectus whether or not you are part of the intended addressees of the information contained in the Supplement.