https://www.gov.uk/government/publications/registered-titles-whole-transfer-tr1/guidance-completing-form-tr1-for-the-transfer-of-registered-property
Panel 4: the transferor(s)
Write here the full names (including all middle names) of all the person(s) who are going to transfer the property. This must be the name(s) of the registered owners in the register, or someone who can prove they can act on their behalf (such as an executor).
If the information you put in this box does not match what appears in the register, you must supply us with evidence as to why. This might be a deed poll or marriage certificate for someone who has changed their name. If one of the joint owners has died, you will need to send us the death certificate or grant of probate.
If the transferor is a company, you must complete the additional fields in the panel.