The vaccine, which is thought to be effective against Covid-19 in nine out of 10 people, could be ready for distribution by next month but it needs to be stored at -80C for it to work.

This ‚ultra-cold‘ state is part of the logistical challenge facing the country, particularly if the vaccine is manufactured overseas.

The professor, from the university‘s Centre for Sustainable Road Freight, explained that it may make more sense to prioritise the AstraZenica Oxford vaccine which can be made in the UK.