Johnny999

I have recently realised due entirely to my oversight that over the last few years I may have submitted Net figures for all or part of my self assessment pension contributions and not Gross for Employee pension contributions to my work scheme and my contributions to my personal pension. What would be the recommended best course of corrective action and for how many years could the correction apply and is it worth the effort for a high rate tax payer? I am reworking all my calculations to be sure but next action will be based on the recommendations. Thanks