Thanks for dropping by the Community, Alfie.
I can guide you on amending the 18/19 EPS.
You'll have to delete, re-create and re-submit the EPS to HMRC to amend the submissions.
Check these articles on how to submit this again:
To learn more about the process, take a look at this article: http://globalsmallbusiness.intuit.com/downloads/UK/QuickBooks/Ruby/learningcenter/tutorials/document...
That should get you on the right track. I'd also appreciate if you can update me on how it goes. I'll be here if there's anything else you need. Have a great day.