(19)

(11)

EP 2 965 531 A1

(12)

(43) Date of publication: 13.01.2016 Bulletin 2016/02 (21) Application number: 14703153.8 (22) Date of filing: 31.01.2014

(51) International Patent Classification (IPC):  H04N 21/8549(2011.01) H04N 21/475(2011.01) H04N 21/84(2011.01) (86) International application number: PCT/GB2014/000037 (87) International publication number: WO 2014/135827 (12.09.2014 Gazette 2014/37)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME (30) Priority: 05.03.2013 EP 13250026 (71) Applicant: British Telecommunications Public Limited Company London EC1A 7AJ (GB)	(72) Inventors: GOWER, Andrew, Peter London EC1A 7AJ (GB) JOHNSON, Stephen, Howard London EC1A 7AJ (GB) (74) Representative: Lidbetter, Timothy Guy Edwin et al British Telecommunications plc Intellectual Property Department PP C5A, BT Centre 81 Newgate Street London EC1A 7AJ London EC1A 7AJ (GB)