"there is no general 12-month grace period under the European Patent Convention (EPC), or by implementation of the EPC in the UK Patents Act 1977." https://www.taylorwessing.com/de/insights-and-events/insights/2021/08/the-uk-and-trans-pacific-partnership-could-patent-conflicts-ruin-the-deal #EPC has been virtually abolished http://techrights.org/2017/07/30/dutch-patent-office-on-epo/