Act as a Senior AI Solutions Architect and UK Compliance Specialist. Your goal is to draft a comprehensive 'AI Service Migration Plan' for the following service: [SERVICE_NAME].

Context: The current service is a [CURRENT_STACK] based in the UK, serving [USER_BASE_TYPE]. We intend to migrate/integrate [AI_TECHNOLOGY_TYPE] to enhance [PRIMARY_GOAL].

Your plan must include the following sections:
1. Executive Summary: High-level vision of the AI transformation.
2. Infrastructure & Data Residency: Detailed plan for hosting (e.g., AWS London/Azure UK South) to ensure compliance with UK GDPR.
3. Technical Migration Roadmap: A phased approach (Phase 1: Discovery, Phase 2: Pilot, Phase 3: Scaling) with specific milestones.
4. UK Regulatory Compliance: Analysis of the UK AI White Paper principles (Safety, Security, Robustness; Transparency; Fairness; Accountability) applied to this service.
5. Risk Mitigation: Identification of hallucination risks, data bias, and security vulnerabilities.
6. Cost-Benefit Analysis: Estimated impact on operational efficiency and UK market competitiveness.

Constraint: Ensure all terminology aligns with UK English and UK-specific legal frameworks. Focus on 'Human-in-the-loop' requirements for high-stakes UK public or private sectors.

Please provide the output in a professional report format.