@DMcG Theregulations on compettive tendering within the UK are quite clear.
However exemption can be claimed for emergencies.

https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/35925/dsd_govt_awareness_guide.p

From the EU guidlines:
Usually, all medium and higher value contracts must be awarded through competitive procedures (tenders), although there are exclusions and exceptions, such as:

    purchasing real estate
    cases of extreme urgency
    situations where there is only one possible supplier

https://europa.eu/youreurope/business/selling-in-eu/public-contracts/public-tendering-rules/index_en.htm
It seems likely most countries would be willing to agree that such things are valid exceptions in future
That is likely the least of many changes.

An interesting article from the economist: The great PPE scramble
Why countries can’t meet the demand for gear against covid-19

https://www.economist.com/international/2020/04/19/why-countries-cant-meet-the-demand-for-gear-against-covid-19?fsrc=newsletter&