Caporegime
Wait, so if I set up a photography business, and used Photoshop to edit the pics and whatever else, I'd have to prove to someone that I bought it?
If you're claiming it as an expense, you should be able to prove it from the outset as HMRC may ask. It may also come up as a point on your audit if your business were large enough to be audited and the audit included a check of your software.

