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You would need authorisation from the FCA.
See here for further information on how to apply for this authorisation: https://www.fca.org.uk/firms/authorisation
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The requirement is that: "whether those who manage A’s affairs have adequate skills and experience and have acted and may be expected to act with probity;"
This site may be of help: http://www.elexica.com/en/resources/microsite/launchplus/get-started/fca-authorisation-basic-process
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