Robson Laidler, an accountancy and business advisory solutions provider, has acquired Teesside-headquartered Tindles Chartered Accountants.

Financial specifics of the transaction were not revealed.

The deal, described as Robson Laidler’s “largest acquisition” in more than 100 years, creates a group with a £9m ($12.2m) combined turnover.

It also increases the firm’s headcount to 126 across Newcastle, Durham, and Teesside offices.

Tindles will retain its 20 staff and operate from Medway House at Teesdale Business Park. Founder Robert Tindle will stay on to integrate the businesses, which will trade separately for six months.

Tindles partner Angela Foster will lead alongside Robson Laidler’s co-managing directors Amy Park and Nick Wilson, and directors Michael Moran, Peter Charles, John Holbrook, and Nick Cunningham.

Nick Wilson said: “This forms an important part of our overall growth and investment strategy where we aim to open more office locations across our five-year-vision. Our strategy is to remain independent whilst keeping our purpose at the forefront of everything we do, which is to make a positive difference to people’s lives and that includes our clients, our people and the wider community. Our vision is to leave a legacy by becoming the firm of choice, growing our business in a way that makes us proud, focusing on both purpose and profit.

“Rob and Angela have built a hugely successful business over many years in Teesside and are a fantastic fit in terms of shared values, services and geographically where we want to grow our business. Ensuring continuity across our whole client base is paramount and we are excited to have Tindles join us on our journey to make the biggest impact possible as a unified force.”

Hay & Kilner and JLF offered legal advice to Robson Laidler on the deal, while Punch Robson represented Tindles.