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.
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Google owns all international Google companies.
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UK.
Great Britain/UK
The United Kingdom owns Turks and Caicos Islands.
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Charles Saatchi
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.