Them not being restrictcted is one thing. But you can only perform a citizens arrest on a indcitable offence. Now i have seen the CPS and the act list off two diffrent things. There is a criteria where you can make a citizens arrest for prevent of harm and also loss of property. And also one for if you belive a cosntable wont arrive before they leave. The latter i think still only applies to indictable offences. The former are both indictable offences if i recall my law correctly.
And then my little scruammage in this leads me to, you can peform citizens arrests, but the person you are arresting may be in their lawful right to stop you. Honestly, if you are holding them for police using any form of restraint barring your hands is kind of iffy, especially if you were carrying them. Security at least has some defence in the matter, but its a little iffy still as they tend to respond to those ones quicker.
So lesson of today, unless they are attacking you or are running off with your property dont bother with citizens arrests.
well almost, you can only preform an arrest where there has been an idictable offence, but most things you may want to grab hold of someone for are indictable offences, such as theft or criminal damage, but not common assault, cycling on the pavement or being a complete ****
however if it turns out what ever you thought they had done either hasn't occurred or occurred by someone else then there is every chance the arrest is unlawful, which is generally a civil matter, that is they can sue you, handcuffing is only going to lead to more damages being paid
you dont have to lay hands on them for this to happen, just stopping them from leaving, say standing in the doorway would be unlawful arrest.
of course if they are innocence and they smack you on the nose for unlawfully arresting them they are in the right or at least not in the wrong, if you respond by smacking them in the nose, wrestling them to the ground and hand cuffing them then you definitely in the wrong.
there another ancient power which is taking action to prevent a breech of the piece, that is ill defined and a bit dodgy
security that lay hands on you to throw you out is different than doing so to arrest you, that relies on the tort of trespass