Merge pull request #92 from alan-turing-institute/metrics-dev #144

Job	Run time
Test on macos-latest with Python 3.11	2m 45s
Test on macos-latest with Python 3.12	2m 35s
Test on ubuntu-latest with Python 3.12	2m 0s
Test on ubuntu-latest with Python 3.11	1m 44s
Test on windows-latest with Python 3.11	2m 55s
Test on windows-latest with Python 3.12	3m 20s
	15m 19s

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