The United Kingdom is a sovereign nation. It is a union between four countries (England, Wales, Scotland, and Northern Ireland) that are then constituent countries due to the sovereignty of the UK as a whole. Due to the UK being a country, nothing owns the UK. The United Kingdom owns itself.
The 'United Kingdom' has never been owned by anyone, although bits of it have been invaded by various other peoples at different times.
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Google owns all international Google companies.
UK.
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Great Britain/UK
The United Kingdom owns Turks and Caicos Islands.
Charles Saatchi
sir alex Ferguson
It is currently Pernod Ricard UK
Apart from the BBC which is publicly funded, all media in the UK is owned by various commercial organizations.
In the UK - you would consult the Land Registry.