Merge pull request #1508 from SpiNNakerManchester/csv_write_fix #4786

Job	Run time
call / validate (ubuntu-latest, 3.12, validate)	4m 17s
call / checks (ubuntu-latest, 3.13)	5m 19s
call / checks (ubuntu-24.04, 3.11)	3m 14s
call / checks (ubuntu-latest, 3.10)	3m 18s
call / checks (ubuntu-22.04, 3.9)	3m 32s
call / checks (ubuntu-20.04, 3.8)	3m 11s
call / tests (windows-latest, 3.12, tests)	2m 46s
call / tests (windows-2019, 3.9, tests)	2m 52s
call / tests (macos-latest, 3.13, tests)	1m 56s
call / tests (macos-13, 3.9, tests)	2m 24s
	32m 49s

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