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(11)

EP 4 482 773 A1

(12)

(43) Date of publication: 01.01.2025 Bulletin 2025/01 (21) Application number: 23700759.6 (22) Date of filing: 11.01.2023

(51) International Patent Classification (IPC):  B65H 75/36(2006.01) G02B 6/44(2006.01) B65H 75/44(2006.01) (52) Cooperative Patent Classification (CPC): B65H 75/36; B65H 75/4476; B65H 2701/32; G02B 6/4457 (86) International application number: PCT/EP2023/050576 (87) International publication number: WO 2023/160899 (31.08.2023 Gazette 2023/35)

(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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: KH MA MD TN (30) Priority: 23.02.2022 GB 202202460 (71) Applicant: British Telecommunications public limited company London, Greater London E1 8EE (GB)	(72) Inventor: WILLIS, Darren London Greater London E1 8EE (GB) (74) Representative: British Telecommunications public limited company Intellectual Property Department  9th Floor One Braham Braham Street London E1 8EE London E1 8EE (GB)