Step 1: Current ratio formula.
\[
\text{Current Ratio} = \frac{\text{Current Assets}}{\text{Current Liabilities}}
\]
Step 2: Classify each item.
- Creditors = Current liability (included).
- Debtors = Current asset (included).
- Bank overdraft = Current liability (included).
- Furniture = Fixed asset (not included).
Step 3: Conclude.
Since Furniture is a fixed asset, it is not considered in current ratio calculation.
Final Answer:
\[
\boxed{\text{Furniture}}
\]