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Did you do a Zs at a socket in the garage? If the L-E really are reversed I would have expected your MFT to complain.
When a tester says line and earth reversed the comparative voltages are being measured and when you have a situation where this reversal is unlikely, as in your case, it is useful to note that the same comparative voltages would be measured if the outgoing neutral from the RCD were disconnected and there was a load connected at the end of circuit.
At the garage Line-earth would be 230V, Line-Neutral would be both the same at 230V (as the load would not drop voltage) and so the pd would be 0V, Neutral-Earth would read 230V because the Neutral is at 230V. These are the potential differences you would measure if Line and earth were reversed.
So in your case I would expect the original RCD had failed and that the neutral connection on the outgoing side of the new RCD is faulty to cause the symptoms you describe.
Brilliant Richard ! Exactly what I was posting at the same time although your version is far better but you've confirmed my suspicions ! Thanks very much.