I have a formula =COUNTA(INDIRECT(A3)) which returns the count of items in a
range which is defined in cell A3, the formula in A3 is below. Is there a
way of not having to include the sheet name (Sheet 1) in cell A3 and to
include in the COUNTA formula.

="'Sheet 1'"&"!C"&A1&":"&"C"&B1

Thanks, Rob