The factory in Wrexham is putting the Oxford vaccine into vials, and it says this:
The Wrexham plant is able to produce around 300 million doses of the vaccine each year, and has been producing 150,000 phials a day for months in readiness to roll out the vaccine across the UK.'
All I've ever read about BioNThek preparation has focussed on storage, e.g. they built loads of suitable refrigeration at various airports to be able to ship it to the US