Merge pull request #62 from alan-turing-institute/metrics-dev #85

Job	Run time
Test on ubuntu-latest with Python 3.11	1m 26s
Test on ubuntu-latest with Python 3.12	1m 38s
Test on macos-latest with Python 3.12	1m 42s
Test on macos-latest with Python 3.11	1m 51s
Test on windows-latest with Python 3.11	2m 6s
Test on windows-latest with Python 3.12	2m 31s
	11m 14s

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