Thanks for the answer, Bob & I'm sorry that I wasn't clear. It's a set of marksheet templates, not report templates.
Esteban, if you don't mind persevering a little longer, this formula from the .XML file:
17154
Means that the formula type (17) is an 'equals'..that the formula exists in column 5 and that it is equal to the value in column 4?
If so, I can easily find & replace them all.