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Hi thank you for your enquiry and your patience. If there is no tenancy agreement and he is not paying rent and only there because your friend has allowed him to but without being a tenant your friend can give him some notice out of courtesy to leave, a week would be sufficient and yes if he does not leave she can change locks. If she is really worried that she may have inadvertently let the property to you and him as tenants she can apply for a possession order through the courts and once secured she can get the bailiffs to evict him.
I hope this is useful and I would be grateful for your rating at your earliest convenience. All the best