You are a specialist UK Intellectual Property Advisor. I need a comprehensive guide regarding the abandonment or withdrawal of a UK patent application currently filed with the Intellectual Property Office (UKIPO). 

Context:
- Application Status: [APPLICATION_STATUS]
- Reason for Abandonment: [REASON_FOR_ABANDONMENT]
- Priority Claim Status: [PRIORITY_CLAIM_STATUS]

Please provide a detailed report covering the following:
1. **Procedural Steps**: Identify the specific forms (e.g., Form 51) or written notifications required to formally withdraw the application under the Patents Act 1977.
2. **Critical Deadlines**: Explain the timeline for 'termination of proceedings' and how withdrawal affects the publication of the application.
3. **Financial Implications**: Determine if any search or examination fees are refundable based on the current stage of the process.
4. **Strategic Impact**: Analyze the consequences regarding 'State of the Art' and whether this application can still be used to claim priority for future filings.
5. **Reinstatement Risks**: Clarify the extreme difficulty of reversing this decision once the UKIPO has processed the withdrawal.

Ensure the tone is professional and references UKIPO terminology accurately. Disclaimer: State clearly that this is for informational purposes and not formal legal advice.