What Is the Significance of the Court of Appeal's Judgment

What is the significance of the Court of Appeal's judgment in MWB Business Exchange Centres Ltd v Rock Advertising (2016) in relation to 'practical benefit' as consideration for contract modifications?

A) 'Practical benefit' can apply in cases where there is a promise to accept less for the same as well as to promises to pay more for the same.
B) 'Practical benefit' can only apply to promises to pay more for the same and not promises to accept less for the same.
C) There will be 'practical benefit' in all cases where the parties agree to a contract modification.