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UK security personnel have the same powers afforded to them as any other private citizen in this country but are allowed to remove someone from private property with the landowner's consent — which equally applies to everyone else.
Security guards can use reasonable force to detain a shoplifter but must inform them that they're under a citizen's arrest. They cannot use policing powers to enforce the law, as most of them are not attested to a UK police force. However, despite them having no special powers, they have been known to harass innocent members of the public — such as journalists, photographers, and other ordinary citizens — despite this usually being unlawful.
Most trained security officers only have citizen powers but would usually be more prepared to deal with a situation than the average citizen, according to the police.