According to the official documentation, the equivalent of provisional applications in the UK is to file an application without requesting search or examination, and subsequently, within 12 months, submit a related priority application for that invention.
What isn't clear in that documentation is whether this initial application needs to contain the claims or simply full disclosure in form of description + related work + figures is sufficient.
If that's the case, would there be any benefit in adding claims to the initial application, or would it be more convenient to add them only to the priority application?
And related question: if an inventor would like to take this route to get to a PCT application, would the deadline be 12 months from the initial filing? If so, going provisional with the UK filing would mean that the patent would still have to be evaluated by the time of the PCT application, or how much time would the applicant have to apply for PCT from the initial application in the UK?
In this case, what would be the correct procedure and timeline to go 1. provisional 2. final 3. PCT 4. individual countries?