Hello, thanks i can see it.
I have some questions though if i may.
Your cells containing formulas, (from my experience, which is not vast, PEMDAS should be used) i thought you had to seperate what parts of your mathematics you wanted to calculate first? for example
=IF(J11="","",-C11*J11+L11*J11)
shows a result of £38. 
C11 = £1,875
J11 = 0.1
L11 = £1,500
So, is your formula supposed to work as C11*J11 (first) (then add the result of) L11*J11?
=IF(J11="","",(C11*J11)+(L11*J11))
showing a result of £338?
Or have i seriously mis read what you have already done?
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