I need help using the ROUNDUP function.

Basically, I have a formula in a cell to do a specific job, the result of which is a currency figure.

Now, what I want to do is ALWAYS round the figure UP to the nearest two decimal places. (e.g. "£18.49" would round up to "£18.50" and "£13.21" would round up to "£13.30".) So you see, I want Excel to disregard whether the last digit is above or below 5, and just always round it up.

Can anybody help me? Please keep in mind that I already have a formula in this cell and cannot see a way in which I could achieve this result without the ROUNDUP function, but also can't figure a way to achieve it with the ROUNDUP function as I already have a formula in the cell.

Thanks in advance.