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Joanne  Seal

Joanne Seal (TEP)

Group Partner* | Guernsey

International Private Client and Trusts

  • Joanne Seal is hardworking and diligent. She is an excellent listener and the type of solicitor whom you don’t have to tell something to twice.
    Legal 500 2022
  • Joanne Seal has excellent technical knowledge whilst being approachable and diplomatic.
    Legal 500
  • Clear, concise and informative. I was extremely happy with the way that Jo dealt with this matter for me. Efficiency and friendliness are not usually found together. I was very impressed as a fellow lawyer.
    UK based solicitor
  • Jo has a calm nature and approachable and friendly style... she is a pleasure to work with.
    Guernsey-based investment company
  • Demonstrates excellent technical knowledge and applies it in a pragmatic way while communicating complex issues clearly
    Legal 500


Joanne is a Group Partner in the International Private Client & Trusts team. Having led an international offshore private client practice for over 10 years, she now heads the Wills & Estate and Private Client services in Guernsey.

Joanne specialises in estate planning and advising on inheritance matters, focusing on complex wills for both local and non-resident individuals. She advises on all aspects of estate administration, from undertaking executorships, advising on Guernsey's probate procedures, dealing with intestacies (where someone has died without a will), to preparing instruments of variation and obtaining Guernsey grants of probate and representation.

Joanne and her team also advise upon local guardianships and powers of attorney, and the recognition of foreign equivalents, property matters with estate connections and a variety of other private client matters.

Joanne also acts as the Primary Deputy Registrar of the Ecclesiastical Court of Guernsey which oversees the issuing of documentation such as grants of representation and local marriage licences.

"It has always been important to me to assist clients to understand and resolve complex issues, particularly against circumstances of difficult emotional backgrounds, with a professional but approachable manner. "


  • Advising UHNW individual (GBP £700+ million) in relation to his estate planning and potential claims against his estate post death.
  • Acting as lead advisor for UHNW client with assets in C.I., South Africa and Scotland co-ordinating multi jurisdiction team of lawyers and tax advisors in relation to lifetime succession planning and involving trusts, foundations and will drafting.
  • Acting for HNW individual (GBP £75+ million) in relation to estate planning and the establishment of trust structures over Guernsey, Canadian and French company assets.
  • Acting as Attorney for HNW individual with physical incapacity (management of assets with value in excess of £2+ million).


Joanne has worked at Collas Crill for the majority of her career after a brief background in matrimonial and child law elsewhere. In addition to her fee-earning responsibilities, and time acting as Deputy Registrar at the local probate Court, Joanne frequently runs a local seminar programme aimed at assisting local organisations and charitable bodies to understand Guernsey's laws on inheritance and capacity issues. She assists the Citizens Advice Bureau as a peer reviewer (reviewing advice given and ensuring it is correct) and is a co-author of the C.I. chapter of ICGL and ISL succession chapters.


Legal 500 Tier 2 Ranked lawyer private client, trusts and tax
Citywealth Leader Award on 3 occasions
IFC Powerwomen Top 200
STEP Young Practitioner of the Year finalist
Top 35 Under 35 Private Client Lawyer on 2 occasions


STEP - TEP Qualified
Law Society

*not a member of Collas Crill LLP in Guernsey
admitted in England and Wales


* Business Assistant
Claire Wilcox

Claire Wilcox

My services
Alderney & Sark Legal Services

Collas Crill's experienced Guernsey team regularly advise on the laws of both Sark and Alderney in addition to Guernsey itself.

Change of name

Changing your name in Guernsey is relatively straightforward but usually requires a brief Court attendance. We can guide you smoothly through the process.

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Contentious Wills, Estates & Probate

We provide fast, cost-effective and sensitive advice on all manner of will related disputes during what is often an extremely upsetting and distressing time for those concerned. We regularly act on multi-party actions for both plaintiffs and defendants.

Middle East Group

The demand for professional advisers who understand the needs of clients in the region has never been more important. With shariah-compliant products and Islamic finance becoming increasingly mainstream and integrated into the global financial system, it is important to partner with a team who understands the complexities of these structures, while also understanding how more traditional structures can be applied to meet the needs of Middle Eastern clients.

Private Client

As global legislation, regulation and taxation constantly change and become more complex, it has never been more important to make long-term plans to secure your future, the future of your family or your business. We cut through the legal jargon to provide clear, practical advice when you most need it and anticipate the challenges you are likely to face so that you can rest assured you and your family are in safe hands at every step of the way.

Probate & Estate Administration

When executors, family or friends of a deceased need to get access to assets held by their loved one, they may be asked to produce a document commonly referred to as a 'grant of probate'. A grant of probate means that an individual is given the right, by the relevant court, to deal with a deceased's estate. The deceased may have left a will or may have died intestate (without a will). It might be the case that probate has already been obtained in another jurisdiction and that a separate grant of probate needs to be obtained in Guernsey or Jersey. This can be an unfamiliar and stressful process. At Collas Crill we have many years' experience in making these types of applications. We are able to assist in simply obtaining the grant of probate, can arrange release and payment of the Channel Island assets to the relevant person, or deal with the full administration of an estate depending on your requirements.

Wills & Estate Planning

Planning for the future is something that people often don't like to think about however it is one of the most important things that you should do during your lifetime. Whether you need simple Wills put in place or more complex estate structuring, our experienced and approachable team can help you organise and plan your affairs for the immediate and longer term future. We work hard to guide you through any issues of concern to ensure that you reach a position where you feel reassured that you are clear as to what will happen to your assets, and the ones you leave behind, in the future.

Wills, Probate & Estate Planning

Managing wealth, asset preservation, planning for succession and inheritance, and writing wills can be a complex and difficult experience. It's important to ensure that your assets are distributed according to your wishes and your family and successors lifestyles are maintained. We have experts in a number of jurisdictions to assist with wills, succession planning, inheritance matters and probate.

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International Succession Laws 2020

Collas Crill has provided the Guernsey chapter of International Succession Laws 2020. The International Succession Laws guide includes information dealing with fixed rights...

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Collas Crill contributes to Guernsey chapter of International Succession Laws 2020

This article was originally published by Bloomsbury Professional G8: Guernsey Fixed rights of inheritance Statement of succession laws and rights of...

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Event 5 May 2023
Past Event

Dying Matters Awareness Day

Group Partner Joanne Seal and Trainee Solicitor Oceane Chandler will be joining other experts at Dying Matters Awareness Day, an open event organised by Argent Funeral Care...

Event 16 Oct 2020
Past Event

STEP Fire & Ice Ball 2020

25th anniversary of the STEP Guernsey's Annual Ball.

Event 13 Apr 2017
Past Event

Write an end to Cancer - Guernsey

Collas Crill and Cancer Research UK will be joining up once again this time to bring over Professor Graham Packham, Professor of Molecular Oncology within Medicine at the...

Event 29 Sep 2016
Past Event

Write an end to Cancer

We are hosting a free event to help people make sense of the local inheritance laws and guide them through the process of making a will. Group partner of wills estates and...

Event 31 May 2016
Past Event

Write an end to Cancer

We are hosting a free event to help people make sense of the local inheritance laws and guide them through the process of making a will. Group partner of wills estates and...

Showing 5 of 5 Results