(19)

(11)

EP 3 899 146 A1

(12)

(43) Date of publication: 27.10.2021 Bulletin 2021/43 (21) Application number: 19832990.6 (22) Date of filing: 18.12.2019

(51) International Patent Classification (IPC):  E02D 5/38(2006.01) E02D 5/50(2006.01) E02D 5/46(2006.01) E02D 5/52(2006.01) (52) Cooperative Patent Classification (CPC): E02D 5/523; E02D 5/46; E02D 5/38 (86) International application number: PCT/GB2019/053606 (87) International publication number: WO 2020/128466 (25.06.2020 Gazette 2020/26)

(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 Designated Validation States: KH MA MD TN (30) Priority: 19.12.2018 GB 201820764 (71) Applicant: KELTBRAY LIMITED Esher, Surrey KT10 9TA (GB)	(72) Inventors: PELKEN, Paul Michael Surrey KT10 9TA (GB) NORMAN, Stuart Surrey KT10 9TA (GB) (74) Representative: Abel & Imray  Westpoint Building James Street West Bath BA1 2DA Bath BA1 2DA (GB)