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Well, the reason I had posted the pix was in the hopes that any answer would have been based on the actual units. I have discovered that thenballast I was sold was for completely different tubes. Hence the completely different looking wiring diagram. I've now obtained the exact replacement...

I realised that it could be that simple, but looking at the diagram it seemed to me (as a non-diagram reader) that the two outside terminals on the old one were common but that the inner ones on the new one were the equivalent. Glad to be reassured. Better to ask a daft question than to risk...

I bought a replacement ballast for a twin lamp thinking I could just swap the wires over. However, the wiring diagram on the case uses a different symbol and I suspect the wires should go in in a different order. The original ballast had numbers 1,2,3,6,7,8 and the wires going in were Red...

Old and new Tridonic ballast wiring diagrams