That does answer my question but I would like to use Excel's built in list extending function.
I should have said that at the beginning!
The problem I have got is that sheet is made up of a list, column A and B contain input, then column C and D contain fomula which work on A and B, this section works correctly, so when cells A and B are filled in cells C and D automatically fill the formula in. This is part of Excel's options for extending format and formula
The problem occurs in column E, which does not continue the formula, I believe this is because I have used Absolute Referencing in the formula which counts a condition in column d, is there any way round this problem?