Thanks Harlan... that is perfect. I figured out it was returning the
array, just couldn't work out the way to turn the array into a number..
seems obvious in hindsight.

Also, many thanks Bob for your suggestions

The final working formula is

SUMPRODUCT((
OFFSET(mod_Records_Filtered_AccountCodeCol,1,,43,) =
CashFlow_Primary!$E12)*
(OFFSET(mod_Records_Filtered_AccountCodeCol,1,SUM( COLUMN(Records_Filtered!AC$1)-COLUMN(mod_Records_Filtered_AccountCodeCol)),43,)) ))


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PeterW
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