From the article you posted-

Health Secretary Matt Hancock yesterday said the tests were showing ‘real promise’ - and revealed the government is investing in manufacturing capacity to produce them in the UK.
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Amazing! Is the UK investing in Innova factories to be built in the UK?
It's possible existing structures can be repurposed for making test kits.
All the test components are plastic or paper. Some injection molding, some assembly, and perhaps farm out the paper boxes to printers to make for them.

Same type of equipment is needed as for making pregnancy tests so it is not uncommon. With the UK expediting permits, it's possible would not take long to implement.

Financial incentives?
Dedicated production
Increased availability.
Increase jobs and GDP.
Transport savings.