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You can make an appilcation at the Land Registry, via their website, for copy of the Deeds to the Freehold. If the Freehold is registered at the Land Registry, you can obtain "Official Copies" which is the official name for a copy of the Deeds. The Offical Copies will show the owner's name and their address. Here is the link-
If the Freehold is not registered, you ar enot going to be able to find out who owns the Freehold by doing any type of search. In these circumstances, you would just need to speak to your neighbours who have recently purchased their Freehold and ask them for the Freeholder's details. Failing this, you can make an application to your local County Court to purchase the Freehold, on the grounds of an absent Freeholder.
I hope this assists and sets out the legal position.