My thanks to Mick for bringing this to my attention.
As some of you will be aware, the Police were recently granted new sweeping powers of arrest.

What some of you may not be aware of is, these changes have impacted the private security industry and security training industries.
Previously, Security Officers (and members of the public) have been able to make a citizens arrest for an arrestable offence as defined by PACE.
The definition of an arrestable offence has been changed and is now included within the Serious Organised Crime Act 2005 (SOCA).

We urge all security personnel to review the new definitions and criteria for ascertaining an arrestable offence and likewise any trainers, training providers and training centres to ensure the training they are providing incorporates these changes.

If anyone is using SITO, SITO BJT or other training materials, please point them to this news article and ask them to update their training modules accordingly as soon as they can to ensure any individuals who are currently undertaking training as part of their pre-security license application are not being given incorrect information.

Full details of the changes can be found under the Read More link

Serious Organised Crime Act 2005
Part 3
Section 110

110	Powers of arrest
	(1) For section 24 of PACE (arrest without warrant for arrestable offences) substitute-
	"24     Arrest without warrant: constables       (1) A constable may arrest without a warrant-     (a) anyone who is about to commit an offence;   (b) anyone who is in the act of committing an offence;   (c) anyone whom he has reasonable grounds for suspecting to be about to commit an offence;   (d) anyone whom he has reasonable grounds for suspecting to be committing an offence.       (2) If a constable has reasonable grounds for suspecting that an offence has been committed, he may arrest without a warrant anyone whom he has reasonable grounds to suspect of being guilty of it.         (3) If an offence has been committed, a constable may arrest without a warrant-     (a) anyone who is guilty of the offence;   (b) anyone whom he has reasonable grounds for suspecting to be guilty of it.       (4) But the power of summary arrest conferred by subsection (1), (2) or (3) is exercisable only if the constable has reasonable grounds for believing that for any of the reasons mentioned in subsection (5) it is necessary to arrest the person in question.         (5) The reasons are-     (a) to enable the name of the person in question to be ascertained (in the case where the constable does not know, and cannot readily ascertain, the person's name, or has reasonable grounds for doubting whether a name given by the person as his name is his real name);   (b) correspondingly as regards the person's address;   (c) to prevent the person in question-   (i) causing physical injury to himself or any other person;   (ii) suffering physical injury;   (iii) causing loss of or damage to property;   (iv) committing an offence against public decency (subject to subsection (6)); or   (v) causing an unlawful obstruction of the highway;   (d) to protect a child or other vulnerable person from the person in question;   (e) to allow the prompt and effective investigation of the offence or of the conduct of the person in question;   (f) to prevent any prosecution for the offence from being hindered by the disappearance of the person in question.       (6) Subsection (5)(c)(iv) applies only where members of the public going about their normal business cannot reasonably be expected to avoid the person in question.   24A      Arrest without warrant: other persons         (1) A person other than a constable may arrest without a warrant-     (a) anyone who is in the act of committing an indictable offence;   (b) anyone whom he has reasonable grounds for suspecting to be committing an indictable offence.       (2) Where an indictable offence has been committed, a person other than a constable may arrest without a warrant-     (a) anyone who is guilty of the offence;   (b) anyone whom he has reasonable grounds for suspecting to be guilty of it.       (3) But the power of summary arrest conferred by subsection (1) or (2) is exercisable only if-     (a) the person making the arrest has reasonable grounds for believing that for any of the reasons mentioned in subsection (4) it is necessary to arrest the person in question; and   (b) it appears to the person making the arrest that it is not reasonably practicable for a constable to make it instead.       (4) The reasons are to prevent the person in question-     (a) causing physical injury to himself or any other person;   (b) suffering physical injury;   (c) causing loss of or damage to property; or   (d) making off before a constable can assume responsibility for him."
	(2) Section 25 of PACE (general arrest conditions) shall cease to have effect.
	(3) In section 66 of PACE (codes of practice), in subsection (1)(a)-
	(a) omit "or" at the end of sub-paragraph (i),
	(b) at the end of sub-paragraph (ii) insert"or
	(iii) to arrest a person;"
	(4) The sections 24 and 24A of PACE substituted by subsection (1) are to have effect in relation to any offence whenever committed.

Full text here