Yes, you were quite right...but I just copied and pasted the wrong
bit. Thanks for the help.

I got my pie values:

For Each value As String In pieValuesStr
        pieValuesDbl.Add(Convert.ToDouble(value))
      Next

      For Each value As Double In pieValuesDbl
        Dim pieAngle As Double = value / 100 * 2 * pi
        pieAngles.Add(pieAngle)
      Next

But this gives me one list...I think I want a list of lists or a 2d
array - so that each pie can be drawn in a different place given a
corresponding list of centre points...Each grouping of values in "parts
(2)" should be in its own list nested in the larger list...

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