Adding names of trustees in a will trust

ahfat41

If the surviving spouse in a will trust adds the name of two trustees who are also beneficiaries, is it a conveyancer solicitor services that are required? On death of the surviving spouse, will,probate  be required to remove death spouse name and as the two trustees are already on the register , does it need to be amended and registered them as legal owners. Sorry if I cannot make myself clear enough with my query. At £318 an hr, trying to get as much advice as possible from the forum. Thanks

tls123

https://www.gov.uk/update-property-records-someone-dies