We are seeking an experienced Payroll expert to support a critical payroll transition project following a business acquisition. This role is pivotal in ensuring a smooth transfer of approximately 300 employees to a new payroll entity using ADP UK. You will work closely with internal stakeholders, the buyer, and ADP to ensure payroll accuracy, compliance, and continuity. Interim Payroll Specialist/Manager (Agency Worker) Location: Hybrid (Swindon-based) Contract: ASAP - 31 December 2025 (potential to extend) Hours: Minimum 18 hours/week (flexible), full-time considered for the right candidate Rate: Based on pro-rated salary of £30,000-£40,000 p.a. (dependent on experience) Key Responsibilities Support the payroll transition and setup of a new entity in ADP UK. Ensure accurate and compliant payroll processing for the go-live month of December. Develop and document clear process flow maps for new payroll procedures. Implement robust processes to capture variable pay, benefits, and pensions. Attend and contribute to ADP UK integration calls and seller stakeholder meetings (and other calls as necessary). Provide knowledge transfer and support to the internal HR team. Own decision-making during the HR Manager's leave (15-28 November), in conjunction with the buyer. Perform detailed payroll checks and validations. Operate autonomously with confidence and clarity. Provide flexible support to meet business needs, with reciprocal flexibility offered. Essential Skills & Experience Proven experience in payroll management. Hands-on experience with ADP UK, including setting up new entities and transferring payrolls. Strong Excel skills for data management and analysis. Ability to create process documentation and flowcharts. Detail-oriented with a commitment to payroll accuracy. Confident decision-maker with autonomous working capability. Desirable Skills Experience with iCHM. Exposure to TUPE payroll transfers. Broader HR operational knowledge. Strategic payroll experience and ability to see the bigger picture. Additional Information Some administrative support will be available for transactional tasks. Flexibility in hours and days is offered and expected. On-site or hybrid working available