Mark O'Callaghan (2001)

Mark O'Callaghan (2001)

Membership Status: Barrister - Full Member Qualified in 2001


General Information

Mark joined Clerksroom in 2017 having built a following as a sole practitioner over a number of years. His career at the Bar began with a common law pupillage in Temple followed by tenancy at a then leading Manchester set. His work is predominantly in personal injury and ancillary fields covering public and employers’ liability, holiday sickness, and road traffic including claims in which allegations of fraud have been intimated. He has a wealth of experience in low speed impact dating to the aftermath of Kearsley and Casey. He is happy to consider instructions on a conditional fee basis.

In credit hire Mark is equally comfortable representing claimants or insurers. On a different slant he appears regularly in flight delay matters, particularly those involving the ‘exceptional circumstance’ defence.

Mark is reading part-time for a Masters degree in medical and healthcare law at Liverpool University. He is keen to take instructions in these areas. He has attended a short course at Sheffield University on Coronial Law and Inquests.

Based in Liverpool, Mark’s practice regularly takes him much further afield. He is happy to travel when required.

Away from work Mark is an accomplished runner, breaking the three-hour barrier in the 2017 London Marathon. He enjoys classical music concerts wherever and whenever possible.

Professional Memberships

PIBA, APIL, Liverpool Law Society



Fees and Feedback

Fees and Feedback

Details regarding our approach to fees can be found at the following link:


Please see “profile” tab for description of the legal services provided by this barrister.

We aim to complete and return all paperwork within 14 days (2 weeks) of receipt if no specific deadline is provided. We can work to much faster timescales if requested or we can agree a specific target date for each individual circumstance. We will always advise at the outset if counsel is unable to meet any deadline.

Each barrister has a standard hourly rate for their work. The individual hourly rate can be agreed when instructions are acknowledged if preferred. We welcome early discussion as to the suitability of a specific barrister for a specific case. The right barrister will have the relevant expertise to deal with the case but will not be too junior, or too senior depending on the complexities.

We aim to allocate all cases to the correct level of experience & seniority which we believe will prove most to be the most cost effective solution for our clients.

If, due to urgency, we allocate paperwork to a more senior member of Clerksroom, we will charge the appropriate hourly rate for the work, not for the barrister. We welcome early discussion to ensure the correct fee is applied to the case at the outset.


All our barristers are regulated by the Bar Standards Board (BSB) and hold a current practising certificate, details can be found at the following link Barristers’ Register

Complaints information

If you are not satisfied with the service provided, you can make a complaint to Chambers. Information on the chambers’ complaints procedure is available at the following link:

If you are not satisfied with the response you receive from my chambers, you can make a complaint to the Legal Ombudsman. You must contact the Legal Ombudsman either within 6 months following the conclusion of our handling your complaint, within 6 years from the date of the act/omission, or 3 years from the date that you should reasonably have known there were grounds for complaint (if the act/omission took place before the 6 October 2010 or was more than six years ago).

The Legal Ombudsman’s details are as follows:

Legal Ombudsman
PO Box 6806
Tel: 0300 555 0333

The Bar Standards Board regulates barristers and specialised legal services businesses in England and Wales, and would like to ask you about the information you found on your legal services provider’s website. Your response will help to inform future changes in this area.   

This survey should take 5-10 minutes to complete. Your responses will be kept anonymous and confidential, not shared with your legal services provider and only used for research purposes.

If you complete this survey and provide the Bar Standards Board with your e-mail address, you will be entered into a prize draw to win a £100 Amazon voucher.

Can't find what you are looking for or prefer to talk? Call Us On 01823 247 247