hi Punter, welcome to the forum. you dont need SUMIF if all you need is a single value. try:
=INDEX($B$2:$F$8,MATCH("Activity 2",$A$2:$A$8,0),MATCH(--("4jan13"),$B$1:$F$1,0))
or if there is a chance "Activity 2" appears more than once, then:
=SUMIF(A2:A8,"Activity 2",INDEX(B2:F8,,MATCH(--("4jan13"),B1:F1,0)))
"Activity 2" & --("4jan13") can be referred to a cell reference where such values exist
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