Merge pull request #418 from SpiNNakerManchester/allow_odd_rtes #1469

Job	Run time
call / validate (ubuntu-latest, 3.12, validate)	3m 26s
call / tests (windows-latest, 3.12, tests)	2m 20s
call / checks (ubuntu-latest, 3.13)	4s
call / tests (windows-2019, 3.8, tests)	2m 20s
call / checks (ubuntu-24.04, 3.11)	2m 33s
call / tests (macos-latest, 3.12, tests)	1m 8s
call / checks (ubuntu-latest, 3.10)	2m 32s
call / tests (macos-12, 3.8, tests)	1m 19s
call / checks (ubuntu-22.04, 3.9)	2m 36s
call / checks (ubuntu-20.04, 3.8)	2m 40s
	20m 58s

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