Ruari Clark is a specialist in Research & Development (R&D) tax relief, with a proven track record of guiding companies through complex and often high-stakes HMRC enquiries. His calm, analytical approach and deep knowledge of tax law—particularly the nuances of the Corporation Tax Act 2009—have earned him praise from clients across a wide range of industries. As one client noted, “He guided and advised on tactics and content of argument and provided excellent advocacy throughout an ultimately successful process.”

Known for his clarity, methodical working style, and ability to distil complex technical information into well-structured legal arguments, Ruari has helped numerous businesses secure and defend significant R&D claims. In one case, a small engineering firm under intense HMRC scrutiny recalled: “The interview was intense, but with expert preparation and deep knowledge of our project, the defence was well handled—and ultimately, the claim was successfully upheld.”

Ruari brings the same rigour and professionalism to all client work, whether handling a straightforward claim or preparing for an HMRC tribunal. He is highly valued for his ability to build trust, communicate effectively, and “drill down to the main issues at heart in a complex matter.” Having worked alongside leading QCs and now pursuing a career at the Bar, Ruari continues to be a standout figure in the R&D tax and legal space.

Eiran heads our team of project analysts and is responsible for ensuring compliance with HMRC’s regulations. Since joining QLC in 2022, he has handled claims for hundreds of clients and provides an efficient and pleasant service. In his role as Lead Consultant, Eiran works to continually adapt and improve our approach, ensuring we always align with the latest guidance and provide robust claims for our clients. Eiran graduated with 1^st Class Honours in Anatomical Sciences, and his experience in scientific and academic research helps him analyse and demonstrate to HMRC the qualifying nature of the work our clients do. Eiran is a keen tennis player and art enthusiast who enjoys reading history, cooking, and drawing in his spare time.

With extensive leadership and management skills, Harriet leads our sales team, working with new and existing clients to ensure they get the very best experience and results. She also helps our clients develop new revenue streams.

Katy has a long history of working with startups and brings expert account analysis skills to QLC clients. Her experience includes financial reports for more than 1,000 claims. She oversees all our current submissions.