A helpful judgment summarizing the circumstances where documents can be rectified to give effect to the parties intentions following a mistake. In this case the accountant miscalculated the number of shares necessary for the parties to qualify for entrepreneurs tax relief and the court rectified the erroneous numbers allowing the tax relief to be claimed.Prowting 1968 Trustee One Ltd and others v Amos-Yeo & another [2015] EWHC 2480 (Ch) (Bailii).