S20(4) allows a discovery decision to be made where you have reasonable grounds for believing a conclusive decision is not correct and this is attributable to fraud or neglect. The wording at S20(4) states that the fraud or neglect can be on the part of:
“acting for them” means acting on their behalf in
respect of the tax credit claim. This could be as an agent or
advisor who helps them prepare their claim or who submits their
signed claim.
However, there are time limits for such a decision -
CCM13110.