Varying a plans condition on outline permission to increase red edge? - Public forum - Planning Advisory Service (PAS)

Conditions are varied under Section 73. Section 73(1) states "This section applies... to applications for planning permission for the development of land without complying with conditions subject to which a previous planning permission was granted". There is therefore a relationship between the land concerned and the conditions imposed. Beyond the land to which the host permission relates, the conditions cannot apply. I therefore cannot see how you could apply to vary a condition which has no legal effect on the additional piece of land concerned (i.e. it does not "exist" in respect of that land).