Hello Userdalrympledecorat,
Welcome to the Community page,
So it all depends on if you need to submit VAT to HMRC or if you need to submit a self-assessment to HMRC.
If you need to submit a Self-assessment to HMRC then you will need the self-employed Quickbooks product.
If you submit VAT to HMRC then you can keep and use the simplestart package you ahve taken out already.