"From 11 March,vaccine supply will increase substantially and be sustained at a higher level for several weeks. Therefore, from the week of 15 March we are now asking systems to plan and support all vaccination centres and local vaccination services to deliver around twice the level of vaccine available in the week of 1 March. "
https://www.england.nhs.uk/coronavirus/wp-content/uploads/sites/52/2021/03/C1165-COVID-19-vaccination-deployment-next-steps-and-plans-for-weeks-of-8-and-15-March.pdf
"From 11 March,vaccine supply will increase substantially and be sustained at a higher level for several weeks. Therefore, from the week of 15 March we are now asking systems to plan and support all vaccination centres and local vaccination services to deliver around twice the level of vaccine available in the week of 1 March. "