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I believe you need to do this in two steps: 1) use a calculation field to add your two fields together, 2) use a summary field to total the calculation field.
Hi Lawrence - it's even simpler than that. There's only one field. But you've given the game away. All I needed was a Summary field, not a Calculation field. So simple - if you know about Summary fields. That's what happens when you don't read the manual from the beginning. Many thanks.