Nominet have comprehensive information about domain disputes and complaints proceedures on their web site. This is the link you need (accurate as of October 2021):
The information there is comprehensive and covers complaints against Registrars, Web Site content, Nominet, Intellectual property rights and more.
If after reading the details there you wish to contact me about any of the Web Sites or Domains I administer please make initial contact via the Contact me form on this site.
It would be helpful (though not essential) to provide a telephone number so I can talk to you personally about such matters.