You have some errors in your sheet labelling and table labelling in the formula.
try this
=IF(ISERROR(IF(VLOOKUP(A8,'Admitted Patients WE 20080921'!$A$1:$G$100,7,FALSE)>G8,"h",IF(VLOOKUP(A8,'Admitted Patients WE 20080921'!$A$1:$G$100,7,FALSE)<G8,"I",IF(VLOOKUP(A8,'Admitted Patients WE 20080921'!$A$1:$G$100,7,FALSE)=G8,"N","")))),"",IF(VLOOKUP(A8,'Admitted Patients WE 20080921'!$A$1:$G$100,7,FALSE)>G8,"h",IF(VLOOKUP(A8,'Admitted Patients WE 20080921'!$A$1:$G$100,7,FALSE)<G8,"I",IF(VLOOKUP(A8,'Admitted Patients WE 20080921'!$A$1:$G$100,7,FALSE)=G8,"N",""))))
Oh, and you need to change the font from wingdings to an alpha font e.g. ariel if you want letters - leave it as it is if you want arrows.
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