Inflexion, a mid-market private equity firm, agreed to invest in Phenna Group, a business focused on the testing, inspection, certification and compliance sector. Financial terms were not disclosed. "Paul and the team have built a very successful business in a short space of time. We have been particularly impressed with their strong track record of backing niche market leaders and making successful acquisitions. We are delighted to get the opportunity to partner with the team to accelerate this growth further both in the UK and internationally," Simon Turner, Inflexion Managing Partner.