Merge pull request #406 from SpiNNakerManchester/better_error #1395

Job	Run time
call / validate (ubuntu-latest, 3.12, validate)	3m 47s
call / checks (ubuntu-24.04, 3.13)	5m 56s
call / tests (windows-latest, 3.12, tests)	2m 23s
call / checks (ubuntu-latest, 3.11, coverage)	2m 23s
call / tests (windows-2019, 3.8, tests)	2m 26s
call / checks (ubuntu-latest, 3.10)	2m 32s
call / tests (macos-latest, 3.12, tests)	1m 46s
call / checks (ubuntu-22.04, 3.9)	2m 39s
call / tests (macos-11, 3.8, tests)	2m 15s
call / checks (ubuntu-20.04, 3.8)	2m 35s
	28m 42s

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