Write a value proposition

I work in marketing at a private health clinic. Help me write a value proposition for one service.

Context: Patients cannot judge clinical quality in advance. They judge how quickly they are seen, how clearly things are explained and whether the cost is predictable.

Before you start, ask me for anything missing from this list:
- The service
- Who buys it and why
- What they would do without us

Then:
1. State the problem in the client's words.
2. State what changes after working with us, using proof I supplied.
3. Write three versions at different lengths.

Give me:
- One sentence
- One paragraph
- Three proof points

Rules:
- Use only the facts I give you. Where something is missing, write [detail needed]. Never invent a number, a name, a quote or a source.
- Give general health information only. Never write anything that reads as advice on a person's own condition, and never suggest a treatment is certain to work or free of risk.
- Write in plain English, in our voice if I have given you a sample.
- Do not tell me what the rules or regulations say. If something may be restricted, flag it and I will check.

Finish with a list headed "Check before this goes out". Include these, plus anything else our clinical lead or the registered manager who approves marketing should see:
- Promises about waiting times or availability we can keep
- Claims about results, and the evidence for them
- Price statements against the published price list