Hi,
Use a couple of helper columns on sheet 2 and a single helper column on sheet1.
On sheet1, assuming the data is currently in columns A:C, add a new helper columns A, and in A1 enter the formula:
Then copy this down the whole of column A
On sheet2, assuming the data is currently in columns A:C, add two new columns A&B. In B1 enter the formula:
and in A1 on sheet2 enter the formula"
Now copy A1:B1 down all 250 rows
Now filter sheet 2 for the word 'New' in column A - these are the additional records.
This assumes the Names and addresses are in exactly the same format and spelt in exactly the same way, i.e. no extraneous characters.
HTH
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