Ditto Music’s label in a box comes in three flavours: the £249 “Premium”, the £399 “Professional” and the eye-watering £3,499 “Enterprise” packages. Each box does most of the paperwork for you, including PPL license for claiming performance rights as well as IIRC codes for registering releases.
You also get certificates, a USB pen loaded with all your company data and personalised management suite software for monitoring and managing royalties. Each package also comes with a business bank account, label web domain and registration as a limited company with Companies House. You’ll still have to find decent music to release by yourself however.
You can find out more at the Ditto website, but it’s worth pointing out that you can achieve most of what the basic package offers for no money, so long as you have the time to spare.