Assistant Site Manager – HV Substation (Walpole, IP23) Location: Walpole 400kV Substation, Midlands Rate: £500 per day (Outside IR35) Contract Type: Full-time, site-based, contract Duration: 3-month contract Hours: 12 days on, 2 days off schedule Start Date: ASAP IR35 Status: Outside IR35 MRR Infrastructure is recruiting on behalf of a leading engineering and construction consultancy supporting the UK’s high-voltage infrastructure network. With a strong presence in the transmission and distribution sector, our client is delivering major grid connections across the country, including the Walpole 400kV Substation development. We are seeking an Assistant Site Manager to join the project delivery team on a short-term basis. This role is suited to a hands-on site professional with prior experience on National Grid substation projects. You will support the Site Manager in supervising daily site operations, ensuring the safe and efficient execution of works across multiple subcontractors and disciplines. You will also act as TP137 cover when the Site Manager is not on site, requiring you to step into a leadership role as needed. You will help ensure compliance with CDM Regulations and internal HSQE policies, deliver safety briefings, review method statements, oversee daily work activities, and support the generation of as-built records. As the project enters its final stages, you’ll play a key role in ensuring quality standards are upheld and the programme is delivered on time. This is a site-based role with national travel required as needed. Candidates must be able to arrange their own travel and accommodation. The role operates on a 12 days on, 2 days off rotation and is best suited to those comfortable working on fast-paced construction projects with a high level of accountability. Essential Requirements: * Full UK driving licence * National Grid Competent Person NSI 6 & 8 * IOSH Managing Safely, SMSTS or SSSTS * CSCS or CCNSG Safety Passport * Minimum 5 years’ experience in the T&D industry, preferably on National Grid sites * Previous supervisory experience * Familiarity with HSG47 * CITB Temporary Works Supervisor (or Coordinator) * First Aid (3-day course) * Previous TP137 or SR163 site experience Desirable: * HNC / HND in Electrical Engineering * Formal electrical training * Impressed Voltage awareness training * IOSH Environmental or equivalent