True North x Change Makers: Northern Star — Oonagh Simms

Oonagh Simms, Founder of The Marshmallowist, shares how a love of food became a business and why marshmallows deserve the same respect as fine chocolate.
We make the difference. Talk to us: 0333 004 4488 | hello@brabners.com
6 min read
Northern Stars, B Corp & Sustainability, Environmental, Property & Construction, Regeneration, Public Sector

Planit is an urban and rural place design practice with an ecological mindset, and a passion for nature recovery, innovation, people and climate resilience.
The company designs regenerative spaces for people to thrive within, to embed prosperity into tomorrow’s built environment. It has three studios in the North — in Greater Manchester, Leeds and Liverpool — but its projects span the entire country, with a fourth studio in London and a fifth in Gloucestershire.
Here, Planit’s Co-Founder and Managing Director, Pete Swift, tells us more for our Northern Stars series.
‘Designing for all life to thrive in balance’ is Planit’s purpose, and we achieve this by working hand-in-hand with a range of stakeholders, including central government, local authorities, communities, developers and designers.
We believe that architecture and design firms, like ourselves, should be impact businesses, not aesthetic providers. ‘Design’, in its broadest sense, has the power to help fix the world and create a more positive future. Yet in too many cases, the measures of success are all wrong.
However, our belief is that any industry that is known to have negative environmental impacts, also has the capacity to be one of the biggest innovators and problem solvers.
For us, the B Corp framework and the five pillars of the Impact Assessment were a great way to guide and measure our impact, because ‘we plant trees, so we save the world’ is never going to cut it. And so, we have looked to embed B Corp principles in everything we do and in every decision we make.
Taking on the challenge of becoming a B Corp is quite a singular goal. You must be a bit like a monk; undertaking methodical, lonely practice and committing to a vision.
Once that's completed, however, you can go and find your tribe.
Our first B Corp Impact Report spoke of the “loneliness of the journey” and the importance of small steps and cumulative progress. Our second report had a different focus — the progress you can make when the whole team and wider ecosystem gets involved.
The shared belief of all 1,500 B Corp certified companies in the UK, is to create a more collaborative and systems-based thinking approach to the future. Together, we share knowledge and best practice, question the status-quo and catalyse bigger-picture thinking on regenerative design.
But rather than having a defined beginning and end, this is a story of constant evolution. While the journey to B Corp, which began in 2018, was an important one for our business, achieving certification in 2020 was not a bookend.
In fact, it was the beginning of Planit moving away from being a ‘sustainable design practice’, towards Regenerative Practices.
For too long, conversations on protecting the future have focused on ‘green’ initiatives and the sustainable transition. We believe a paradigm-shift in our worldview is needed; one which is based in restorative and regenerative practices, where people live as part of nature, actively participating within it.
To inform the path ahead, we recently commissioned a ‘Perceptions Study’, carried out by an expert who asked impactful and near-existential questions to leaders of the development industry in the UK and beyond.
Their resounding conclusion can be described as: “What got us here, won’t get us there.”
Or even more simply, it’s time for change.
This drove us to compile our first ‘Strategic Plan’ and with that a clear and ambitious near-future mission: by 2028, we will ensure that each project we deliver will have a measurable net positive impact for all living things.
As dedicated stewards of biodiversity and nature, we are committed to embracing climate positive design, creating climate resilient landscapes and communities, and raising awareness of the importance of green infrastructure in cities.
Our journey started 25 years ago and since we have completed more than 3,000 projects, which aim to restore balance between people, places and nature, fostering collaboration to drive positive change.
This approach is perhaps best exemplified in our placegrowing projects in the North, many of which have delivered significant impact:
If you are interested in finding out how Planit can support your project, then you can reach any one of our five studios here.
Download the True North report and join the network.
Drawing on 25 years of data alongside insights from regeneration leaders, our new research report — Making Places Work — examines how places across the North have changed over time and identifies where genuine, sustained progress has been achieved.
It's a practical tool for policymakers, developers, investors and communities who want to create places that enable the people who live and work in them to thrive.
Download the report to get the full picture.

Oonagh Simms, Founder of The Marshmallowist, shares how a love of food became a business and why marshmallows deserve the same respect as fine chocolate.

We discuss the key opportunities and considerations shaping the future of sustainable AI and quantum‑powered technology.

Dr Edward Lynch, Founder of helfy®, shares the story of why he left a traditional NHS path to build a business focused on preventing chronic disease.

We explore how the UK’s shift to clean power is reshaping industry, infrastructure and the future of energy security.

True North member Michelle Laithwaite, CEO and Co‑Founder of FuelHub, talks how it grew from a kitchen table idea into a nationwide business.
True North member Anita Frost, Founder of Green Bean Studios, discusses her journey, the pandemic and why children’s IP shapes the future workforce.

True North member Rachael Baker, Managing Director of JJ Smith, talks leadership, skills and the future of construction on the Change Makers podcast.

We explore how structural, environmental and organisational shifts are shaping the 2026 Winter Olympic and Paralympic Games.

Our award-winning regeneration team has launched a new report that uncovers how life and work across the North of England has changed since the millennium.

We explore the new Order that gives local authorities a new ability to shape below-threshold procurement markets in ways that were previously off-limits.

Our award-winning litigation team has secured a High Court judgment in favour of Acasta European Insurance Company Limited.

Samuel Remi-Akinwale is the CEO of Young Manchester, a youth-led partnership organisation that champions opportunities for young people across the city.

We explore the upcoming changes introduced by the Procurement Act 2023, when they take effect and what they mean for contracting authorities.

Some tech businesses are exploring how their commercial frameworks could evolve through smarter, values-driven contracting.

We provide an overview of key construction law cases from 2025 and explore the practical implications and emerging trends that are shaping the industry.

We explore how contracting authorities must approach contract variations under the Procurement Act 2023.

We explore what the English Devolution and Community Empowerment Bill means in practice and how its reforms may affect both retail tenants and landlords.

We explore the new minimum financial thresholds that will apply to public contracts and the application of the Procurement Act 2023 from 1 January 2026.

We explore the proposed reforms to environmental penalties and what they could mean for enforcement, financial exposure and reputational risk.
Chelsea Slater is the co-founder and CEO of InnovateHer, an organisation on a mission to support girls and non-binary teenagers into the tech industry.

Explore the legal and practical implications of the 'pay now, argue later' principle in construction disputes through the landmark case of VMA Services Ltd v Project One London Ltd.

Creating the conditions to enable private sector investment and construction in Lancashire holds the key to the county's long-term economic growth.

Claire McColgan MBE is Liverpool City Council’s Director of Culture & Major Events and has helped shape the city's cultural and economic transformations over the past two decades.

We reveal how fire consultants and fire authority inspectors approach fire safety compliance and risk management in care homes.

The UK’s housing sector in 2025 is undergoing major shifts, with Government reforms aiming to boost supply and affordability.