A definitive answer (from the Land Registry):
https://hmlandregistry.blog.gov.uk/2018/02/13/property-owner-dies/
Basically the executor needs to obtain probate and then complete form TR1 (transferring the title in the property from the estate of the deceased person directly to the buyer, without any requirement to transfer it to a beneficiary first). That, of course, assumes that the property is to be sold under the provisions of the will. If the will leaves the property to a specific beneficiary then it will be entirely up to them as to whether the property is placed on the market, so the executor should complete form AS1 to pass the title to the beneficiary.