COVID-19 vaccines in the UK, pharmaceutical companies have hit back at government claims that access to enough jabs was a "limiting factor", insisting there was no issue at their end.While AstraZeneca says it expects 2 million doses of the Oxford University vaccine to be ready each week in just over a fortnight, Pfizer BioNTech said the number of doses it has now sent to the UK is "in the millions".The Pfizer and Oxford/AstraZeneca jabs are the two vaccines against coronavirus that are approved for rollout in the UK."The plan is then to build it up fairly rapidly; by the third week of January we should get to 2 million a week," an AstraZeneca source told 'The Times' newspaper."The deliveries to the UK are on track and progressing according.