Skip to main content

Gillian Tatt

Gillian Tatt photo

Gillian Tatt


Gillian is a Partner in our Dispute Resolution team.

Contact Team

A little more

Gillian has been a partner at Square One for over a decade and has more than 25 years’ experience in helping clients with problems which arise in the running of their businesses. A tenacious and determined litigator, Gillian will help you navigate the process of dispute resolution to achieve the best outcome.

Gillian wins the loyalty of clients by her ‘hands on’ approach and clear advice. She will give you advice you can trust and will work with you throughout the process.

She has substantial experience of a broad range of matters including professional negligence claims, contract disputes, shareholder and partnership fall outs, financial services mis-selling, insurance disputes, IP and commercial property disputes, claims by the Business Software Alliance and insolvency. She has managed complex and valuable litigation cases in court, including group actions, to successful conclusions.

Gillian is experienced in advising on cross-border disputes, at all levels of the courts and in various forms of alternative dispute resolution including expert determinations, arbitration, mediation, claims to the Legal Ombudsman, the Financial Ombudsman Service and the Pensions Ombudsman.

Gillian is tenacious, diligent and very determined. In addition, and what I particularly welcome, is the fact that she is fully prepared to challenge the view of the client and to make a firm recommendation rather than just sit back and react to a client’s aspiration.

Peter Stephenson, Executive Chairman, Able UK

The Square One Law team are excellent. They always provide us not only with rapid, detailed and most of all, cost effective guidance but also advice that is very commercial.

Trevor SilverChairman, Landid

We’ve worked with Square One Law across our business from the start. They understand our proposition and can deliver in terms of us achieving quick turnaround times for our customer base, which will promote new benchmarks for the industry.

Stephen PrattHead of Originations, Atom Bank

It is important to have a strong and trusted team of professional advisors. That is why I use Square One Law.

Peter StephensonExecutive Chairman, Able UK

The reason that our partnership has worked is that when you’re building a business you need to work with organisations that will take the time to understand your business, that have all the resource base that you need and that you trust. I think that when you build up a start-up you need to pull on a lot of resources and having an organisation that you can just lift up the phone – you can talk to somebody – and they’ll give you some interim advice on the spot, then that’s great; then you can go through more detail in the process.

Matthew LumsdenCEO, Connected Energy

The Square One Law team played a pivotal role in the launch and growth of North East Times. Their input extended beyond legal matters, offering crucial business advice that spurred our early initiatives. Recently, their support proved invaluable once more. Their guidance was key in securing a new investment, enabling our expansion into digital publishing and bespoke high-level events. Their pragmatic and efficient approach was refreshing and has made a big contribution to the growth of our business.

Pete Mallon and John DunnsNorth East Times

I would not have taken the business anywhere other than with Square One from my previous experiences but you all - without compromise - delivered over and above my expectations. My whole Team commented on a regular basis as to the professional and supportive interaction throughout the project. I cannot thank you all enough and would without question recommend Square One to anyone as my first choice for any legal advice. Great to work alongside and do business with good, kind, committed and professional people with great values.

Gavin DunnFormer owner and director of RH Irving