Our Trustees

Mike Mintram - Chair from 28 July 2016

Mike has enjoyed visiting the Arboretum since his children were young and wishes to continue supporting the Charity's work during a critical stage in Westonbirt's development.

He has a strong interest in the natural environment and conserving our natural heritage and would like to champion improving access to the Arboretum and creating better educational opportunities for visitors and members.

Mike has worked in marketing for most of his career and held a variety of senior mangement roles for membership and financial services organisations.  Most recently he worked at Ecclasiastical (a company owned by a charity) covering marketing and management of personal customers and small organisations.  

He is a non-executive director of Marketing Gloucester Limited and a trustee director for Worcestershire Carers.

He also volunteers for the Gloucester & Distruct Citizens Advice Bureau.

Mike hopes to offer additional and relevant experience to the Friends, especially in marketing strategy development, membership support and fundraising


Stephen Segar OBE
Stephen became a Trustee in 1999 and Chair in April 2004, having been Treasurer for the previous 5 years.

After a career with Lloyds TSB, Stephen developed a portfolio of voluntary and community roles including, Treasurer to Cotswold Counselling and also to Cirencester Macmillan Cancer Support Committee.  

 His leisure interests include caravanning, dog walking and membership of Cirencester Rotary Club (having been a previous President). 
Stephen stepped down as Chairman in July 2016 after a remarkable 12 years which saw many changes within the Charity and the Westonbirt Project.

The Charity is also delighted for Stephen that he was awarded an OBE in the 2016 Queen's Birthday Honours for services to natural heritge and the community.  This recognises Stephen's significant contribution to the Charity and our National Arboretum.

We are grateful that Stephen continues his tenure as a trustee.


Sue Bradley-Jones – Vice Chair (shared role)
Sue became a volunteer guide at the Arboretum in 1995 with a special interest in the history of the collection.  She was involved in creating the tours of the Holfords’ House - now Westonbirt School.

Sue became a Trustee in 2003 as coordinator of FOWA Member Events and took on Grants Management in April 2009 ensuring funds are allocated to agreed projects in accordance with the Charity objectives.

Involved in garden design for some years; she has a wide-ranging knowledge of trees and plants.

Seeing the Charity playing a key role in ensuring the sustainable future of the Arboretum’s unique landscape and collection of trees, Sue also believes the Charity provides vital continuity in an uncertain economic environment.

Gavin Grant
Gavin worked in public relations for 35 years including being the global head of communications at The Body Shop International and had responsibility for the company’s foundation.  He moved into consultancy in 1999.  As former Chief Executive of the RSPCA, Gavin gained extensive experience of management in the charity sector (particularly environmental and conservation organisations).

He volunteers for various causes, serves as a Town Councillor and chairs a Trustee Board of a small charity supporting people with physical, psychological and personal problems.  
Gavin hopes to devote both passion for the natural world and communication skills to the benefit of the arboretum, the Friends and the future of both.

John Hammond
Following a career as a Chartered Human Resources (HR) professional. Following a career with British Gas, Transco and National Grid in a variety of operational and specialist HR roles,  John took early retirement in 2009 and worked for a HR Case Manager for the Ministry of Justice until recently.

John has lived locally for the past 30 years and is actively involved in the local community as a Parish Councilor and Chair.

He joined the Friends in 2001 having visited the Arboretum with his family on many occasions, and became a Trustee in 2009.

John is keen to contribute to the organisational health of the Charity and support the Arboretum to sensitively promote greater and wider public access and so help preserve its heritage for the future; whilst retaining its essential character.

Margaret Headen
Margaret was a Barrister for almost 42 years and Justices’ Clerk in Gloucestershire from 1983 managing several offices, budgets and staff as well as principal legal advisor to the Magistrates until taking early retirement.

She obtained a Diploma in Management Studies.

In working and voluntary capacities, Margaret delivered business planning, training and project work.
Margaret is a long standing member of Soroptimist International (a service club for women in management and professions); having been President twice she is now Programme Action Officer and Vice President.

She chaired the Local Advisory Council for BBC Radio Gloucestershire for 3 years from 2001.

Margaret has been Trustee, Director and Company Secretary of Victim Support Gloucestershire from 2001 until 2006 as well as Trustee for the local branch of Victim Support for over 18 years (4 of which as Chair).

Her other interests are wide and include natural history and conservation.

Following retirement in 2001, Margaret became a Friend and a volunteer in 2004.  She currently assists as a Welcome Volunteer, guide sweeping, training and Member Events.

Margaret became a Trustee in 2007 and believes in retaining the best of our National Arboretum in a changing environment.

Mike Howarth
Mike has worked in further and higher education for 33 years, mainly on academic and corporate development but with a particular interest in quality assurance.  He was an HM Inspector for six years.

More recently Mike served as an elected Member of South Hams District Council, and on various other local community groups in South Devon.

On moving to Malmesbury in 2012 to be nearer to grandchildren, Mike became an Information Volunteer and Volunteer Guide at Westonbirt.  He is passionate about the wonderful landscape at Westonbirt inherited from the Holfords, and is keen for more people to share a deeper appreciation of trees.

His other interests include walking, and gardening when time permits

Malcolm Potter
Malcolm Malcolm practised as an architect in private and public sectors in London since the mid 1960s, including the position of Director of Architecture and Surveying to the London Borough of Camden from 1986 to 1992. Since the mid 1990s, Malcolm has been involved in delivering construction management consultancy services, including research into construction best practice and procurement.

Malcolm became a Trustee in 2008 and has been able to offer his professional advice and experience in support of the Westonbirt Project and continues support of capital development through the Programme Board. 

Now retired, Malcolm took the opportunity to learn and make new musical instruments and spend more time painting and travelling. Until recently, he was also a Board Member of Bethnal Green and Victoria Park Housing Association in London.

Andrew Smith - Arboretum Director
Andrew was responsible for Forestry Commission England’s grants and regulations systems based in Cambridge and latterly Bristol and for the past five years has been the lead on tree health.  Prior to that, he was District Manager at North York Moors for eight years and worked for the FC at Aberfoyle, Thetford and Sherwood. He has a degree in Forestry from Bangor University and took up the post of Director at Westonbirt, The National Arboretum in July 2015.

Andrew lives in Westbury-on-Trym with his wife and two sons. They enjoy family time away in their caravan and Andrew is a keen gardener.

Karen Thornton - Vice Chair (shared role)
Karen is a qualified accountant and worked in Local Government from 1985 to 2007.

Her roles have included policy formulation, strategic forward and financial planning, probity and internal control.

She headed up financial services and the audit team at Cotswold District Council.

Karen is passionate about the value to society of the public and not for profit sectors.
She was appointed as Trustee in 2005 to strengthen the management and financial skill set of the Trustee Board.

Karen is involved with updating the governance structure of the Charity, is Chair of Finance & Governance Committee and significantly contributed to the Westonbirt Project.

Karen feels the Charity is a fantastic addition to the National Arboretum stating "Trustees have the responsibility to keep the organisation fit for purpose and best able to support the work of this wonderful national resource; Westonbirt, The National Arboretum".


Volunteers at Westonbirt

Our volunteers help make Westonbirt what it is. Find out more about our rewarding opportunities.