Modi-BoJo virtual summit: SII to make vaccine in Britain New Delhi Pune-based Serum Institute of Indiaâs plans to manufacture vaccines in the UK was conveyed to PM Modi by none other than the his British counterpart Boris Johnson at the India-UK virtual summit on Tuesday. Headed by chief executive officer Adar Poonawala, the SII is the worldâs largest vaccine maker by volume, and has led in producing the lower-cost AstraZeneca coronavirus shot. The institute makes 60-70 million doses a month, and is aiming for 100 million doses by July. Johnsonâs Downing Street office said the £240 million ($334 million) project would include a sales office, âclinical trials, research and development and possibly manufacturing of vaccinesâ.