Please this link: https://www.gov.uk/hmrc-internal-manuals/vat-registration-manual/vatreg23250
You can register voluntarily and claim input VAT as long as you meet these conditions:
• they have a business establishment or usual place of residence in the UK, and
• they receive taxable supplies from UK VAT-registered businesses, for which they are entitled to recover input tax, or
• they receive taxable supplies from another Member State which are subject to the reverse charge, or
• they import goods into the UK, for which they are entitled to recover input tax.