Merge pull request #283 from SpiNNakerManchester/remove_unused #1077

Job	Run time
call / validate (ubuntu-latest, 3.12, validate)	2m 4s
call / checks (ubuntu-latest, 3.13)	1m 17s
call / tests (windows-latest, 3.12, tests)	1m 19s
call / checks (ubuntu-24.04, 3.11)	1m 6s
call / tests (windows-2019, 3.9, tests)	1m 18s
call / checks (ubuntu-latest, 3.10)	1m 11s
call / tests (macos-latest, 3.13, tests)	30s
call / checks (ubuntu-22.04, 3.9)	1m 8s
call / tests (macos-13, 3.9, tests)	41s
call / checks (ubuntu-20.04, 3.8)	1m 11s
	11m 45s

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