I am a member of the Association of Leasehold Enfranchisement Practitioners, ALEP.
"Membership of this professional association is a badge of assurance to leaseholders and freeholders that they can be sure of a consistently high level of service, integrity and professionalism."
I am an Associate of the RICS.
"The RICS Associate (AssocRICS) qualification recognises the skills of individuals with relevant work experience and vocational qualifications. Associate is a respected qualification that demonstrates commercial and technical standards and professional ethics. It shows you are qualified, regulated and trusted."
The Leasehold Advisory Service provide free advice on residential leasehold and park homes law. They are an independent body, and only advise leaseholders and park home owners. All of their advisers are legally qualified.
Link to the toolkit which details the HMRC's view of how tax law should be applied for Inheritance Tax purposes.