Introducing Twenty5: a new strategic and innovative start-up in the Planning Consultancy sector has launched today.

Birmingham & Cambridge, UK – 25/07/2025 – A new entrant to the UK planning market

has officially launched. Twenty5, founded by four former Barton Willmore Planning

Partners, is a specialist planning advisory business serving clients nationwide from its dual

bases in Birmingham and Cambridge.

Founders Kathryn Ventham, Mark Sitch, Gareth Wilson, and Lyndon Gill combine decades

of experience in strategic and immediate planning and project delivery with a shared

passion for delivering tailored client focused planning solutions that navigate the

complexities of the planning system, shape high quality places and create lasting value.

Twenty5 offers unrivalled strategic insight alongside a creative and collaborative approach,

ensuring projects have the optimal prospects of success, alongside a highly experienced

consents delivery team. 

Twenty5 will partner with clients across sectors, including residential and new settlements,

industrial and commercial, healthcare and education, energy and infrastructure from

concept through to delivery.

“Twenty5 was created to offer a more agile, client-focused approach – combining big-

picture thinking with detailed expertise,” said Kathryn Ventham, Senior Director. “We’re

excited to bring something fresh to the industry while staying rooted in trust, rigour, and

relationships.”

The team’s national outlook, underpinned by strong regional knowledge, enables Twenty5

 to unlock opportunity across the UK – whether that means promoting strategic land,

navigating complex urban regeneration projects, or securing planning consents for high-

profile developments.

Twenty5 is now open to new instructions and partnerships.