HR Business Partner Milton Keynes £45,000 Permanent The Opportunity Are you an ambitious HR professional looking to "shine" in a high-impact role? We are seeking a dynamic, analytical, and highly confident HR Business Partner to join a fast-paced HR team in Milton Keynes. This is more than just a generalist role; it is a chance to be a strategic partner to the Senior Leadership Team while remaining "hands-on" in an open-door environment.You will be a key driver of people performance in a unionised, safety-critical setting, balancing a complex ER caseload with the leadership of a dedicated team. If you are a quick thinker who thrives when "spinning plates" and wants to deputise for the HR Manager, this is your next career step.Responsibilities: ER Mastery: Lead and resolve complex and routine Employee Relations cases, including disciplinary, grievance, and performance management. Leadership: Directly supervise and mentor a team of HR Administrators/Advisors, acting as the primary escalation point for complex queries. Strategic Liaison: Partner with SLT and line managers to align HR activities with business objectives, providing expert, commercially-minded legal advice. Union Relations: Manage relationships and negotiations within a unionised environment- this experience is essential. Change Management: Support and advise on business-critical activities including redundancy, TUPE, and restructuring. Coaching and Development: Confidently present to and upskill managers on ER be