Did new variant SARS-CoV-2 B.1.1.7 spread during English lockdown?

Did the new SARS-CoV-2 B.1.1.7 lineage spread during the English national lockdown? Rising numbers and estimated higher R value suggest so. https://virological.org/t/lineage-specific-growth-of-sars-cov-2-b-1-1-7-during-the-english-national-lockdown/575   Image by Наркологическая Клиника from Pixabay