removing a name from the title deed

If a property was purchased with another (not spouse) and they no longer have an interest in the property, how do I remove their name from the title deed and have it solely in one name?

Thanks

Andrew - the registered owners need to transfer it to the new ones. The legal title is always transferred as a WHOLE
Registering land or property with HM Land Registry: Change the registered owner name - GOV.UK (www.gov.uk)