Welcome to tressillian

We are a small London-based
consultancy specialising in
delivering tough assignments
for our clients.


We are tressillian

tressillian consultants is David Morgan and Sara Corrin - bright and savvy management consultants. We bring decades worth of experience to our clients and deliver it with insight and humour.

We can turn our hands at most things, but we really excel at real-estate transformation and regulatory/process-driven change in Financial Services. Check out some of our projects to get a real flavour of what we do for our clients.

Client one-off savings (£m)
Projects Completed
Client annual savings (£m)

What We Do

Years of experience are the catalyst for sustained change and value generation for our clients.

Programme delivery

We inject experience and pragamatism into our clients' delivery teams - sorting out and delivering the tough programmes that others can't manage. We offer a full gamut of programme management interventions - from full delivery to assurance.

Property and estates

Property and premises are significant cost burdens for most organisaitons. We help our clients strategicially rationalise their portfolios and/or re-purpose specific property assets to improve utilisation and reduce cost.


We don't believe in off-the-shelves approaches to strategy definition - so we work with our clients to develop no-nonsense, evidence-based and tailored approachs that work.


Our clients face challenges and opportunities all the time and need to adapt to remain relevant and cost effective. We make things work better by re-aligning processes and optimising working practices and cultures.

Recent Projects

We are proud of what we do, check out some of our projects

Old Admiralty Building

Renovation of a significant heritage building

Old Admiralty Building is an iconic and nationally significant building within the Government estate on Horseguards in London. We have been appointed as client Programme Director to successfully navigate the Department for Education through a complex property and change management programme in anticipation of its occupation of the building in 2019. The 5-year programme will refurbish the building to create a modern, flexible and vibrant working environment - whilst retaining many of the iconic and heritage features of the building.


Regulatory reform and corporate restructuring

In 2012, we were appointed communications and renaming programme manager for the pan-European legal restructuring of Chartis Europe S. A. and Chartis Europe Limited to AIG Europe Limited. We were responsible for managing a team of 60+ people across 26 European countries renaming 20,000+ business documents and issuing 2.4million legal notification letters to policyholders.

Northern Rock

Corporate restructuring and financial systems

In 2009, we were the Programme Manager on the Finance Change and Systems Programme at Northern Rock plc - a significant element of a restructuring programme splitting the bank into a new Bank and an Asset company. We were responsible for managing the team delivering new financial processes, reporting and systems, managing programme risks and managing senior stakeholders within the Bank.

Later, in early 2010, Northern Rock plc was gearing up for the removal of the government-back 100% savings guarantees. We were appointed to manage a programme to operationally prepare the bank and were specifically responsible for establishing and managing a cross-functional delivery team and stakeholder management of senior executives and regulatory bodies.

Department for Business, Innovation and Skills

Estate portfolio restructuring

We delivered a number of significant programmes for the Department - ranging from implementation of smarter working, buiding refurbishments and estate portfolio rationalsiation. The most recent and impactful included developing the national strategy, business case and implementation approach for the large-scale transformation of the BIS and Partner organisations' collective estate - approximately 20 Partners and >300 premises/facilities.


Programme management of an Automatic Vehicle Information System

We were programme manager for the programme mobilisaton and procurement phases of the AVIS Programme - the implementation of an Automated Vehicle Inspection System on Bombardier's Gautrain in Johannesburg, South Africa. The programme encompassed the specification, design and implementation of specialist detection technology, systems integration and vehicle maintenance process re-engineering.

Barclays Bank

Flexible workplaces

We worked with Barclays Bank to define its approach to the design and implementation of flexible workplaces within the Global Retail and Commercial Bank. This included defining global standards and policies, governance arrangements, change management approaches and design principles. As part of the project we managed the implementation of a flexible workplace in one of the bank's core buildings within the Canary Wharf estate.

Our Clients

tressillian has worked with some great clients - all top-notch organisations. This stimulates and sustains us.

David has been a great asset to the Department throughout the long (!) Old Admiralty Building programme. We like him because he is a skilled communicator with his own unique blend of tenacity, pragmatism and no-nonsense approach. Highly recommended.

Author image
Mike Green Director General, Department for Education

I appreciate that the deadlines have been very difficult, and we've had some "bumps" along the way but I have been very impressed with the "can do" attitude you have shown and the enthusiasm with which you have approached the task.

Author image
David Miller AIG - Head of UK Client Services

David is my "go to" advisor for delivering challenging estates programmes; knowledgeable, pragmatic and driven.

Author image
Charles Stevens Head of Estates

I've never seen a "green" audit report before; this must be good.

Author image
Chris Wormald Permanent Secretary, Department for Education

This is the seminal piece of strategy work in the Government estates arena.

Author image
Graham Atkinson UK Government Property Unit

Contact Us

Give us a shout

Contact form

Something went wrong. Please try again.
Your message was sent, thank you!

Contact Info

Where to find us

106 Tressillian Road
United Kingdom

Email us at

Call us on

Phone: +44 (0)7720 683600