I would love more discussion on this topic. There MUST be UK Sole Traders here, with experience, who to avoid, who to try. Privacy being a key aspect to many of my peers. And of course buyer beware - UK GOV aren't using that term in their blurb.
Currently exploring this option - anyone used them? https://www.taxheaven.app/about
And little on the context
https://makingtaxdigital.campaign.gov.uk/
"You’ll need to... Use recognised software such as an app on your phone or laptop
to record income and expenses
Send quarterly updates to HMRC from this software
Submit your tax return by 31 January each year"