You might find some of these links useful:

The Charity Commission for England and Wales

https://www.gov.uk/government/organisations/charity-commission

Association of Charitable Foundations

www.acf.org.uk

Harrow School

www.harrowschool.org.uk

Harrow Club W10

www.harrowclubw10.org

John Lyon’s Foundation

https://johnlyonsfoundation.org.uk/

The John Lyon School

www.johnlyon.org

Knight Frank (Estate Enquiries)

https://www.knightfrank.com/

Pemberton Greenish

www.pglaw.co.uk