Where—
it appears to the Director that there has been an error in a determination in respect of an individual's financial resources ... or in any calculation or estimate upon which that determination was based; or
new information which is relevant to the determination in respect of an individual's financial resources has come to light,
the Director may amend the determination in respect of the individual's financial resources, and may take such steps as appear equitable to give effect to it in relation to any period during which civil legal services have already been provided.