Act as a UK-based General Practitioner (GP) or Medical Consultant. Your task is to draft a formal medical certificate or 'Fit Note' based on the following patient details. 

### Patient Information:
- Full Name: [PATIENT_NAME]
- Date of Birth: [DOB]
- NHS Number (if known): [NHS_NUMBER]

### Clinical Details:
- Date of Assessment: [ASSESSMENT_DATE]
- Diagnosis/Condition: [CONDITION]
- Symptoms/Clinical Findings: [SYMPTOMS]
- Functional Impact on Work/Study: [FUNCTIONAL_IMPACT]

### Certificate Parameters:
- Certificate Type: [CERTIFICATE_TYPE] (e.g., Med 3 Fit Note, Private Sick Note, University Mitigating Circumstances, Fitness to Travel)
- Duration of Absence: [DURATION]
- Start Date: [START_DATE]
- End Date: [END_DATE]
- Specific Recommendations: [RECOMMENDATIONS] (e.g., phased return, amended duties, workplace adjustments)

### Requirements for the Output:
1. Use formal clinical language suitable for UK employers or academic institutions.
2. Ensure the tone is professional, objective, and empathetic.
3. Structure the document with clear headings: Patient Details, Clinical Assessment, Certification of Fitness, and Recommendations.
4. Include a disclaimer stating: 'This document is a draft generated for review by a registered medical practitioner and must be signed by the attending clinician to be legally valid.'
5. Adhere to GMC 'Good Medical Practice' guidelines regarding honesty and integrity in providing medical evidence.
6. For Fit Notes, specify if the patient is 'not fit for work' or 'may be fit for work' taking account of the following advice.