(19)

(11)

EP 4 798 807 A1

(12)

(43) Date of publication: 02.09.2026 Bulletin 2026/36 (21) Application number: 24730004.9 (22) Date of filing: 28.05.2024

(51) International Patent Classification (IPC):  E04H 17/12(2006.01) E04H 17/08(2006.01) E04H 17/10(2006.01) (52) Cooperative Patent Classification (CPC): E04H 17/12; E04H 17/124; E04H 17/08 (86) International application number: PCT/EP2024/064606 (87) International publication number: WO 2025/087568 (01.05.2025 Gazette 2025/18)

(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: GE KH MA MD TN (30) Priority: 26.10.2023 GB 202316376 17.01.2024 GB 202400661 (71) Applicant: WENTFORTH ASSOCIATES LTD Gloucester, Gloucestershire GL56 0QJ (GB)	(72) Inventor: MORRIS, Derek Gloucester, Gloucestershire GL54 1JU (GB) (74) Representative: Murgitroyd & Company  165-169 Scotland Street Glasgow G5 8PL Glasgow G5 8PL (GB)