Suspended prison sentences are always accompanied by “requirements” rather like community order requirements. Those subject to a suspended sentence will also have to comply with these requirements which may include, for example, supervision by the probation service, unpaid work, or a curfew order (there are many others but these are the most frequently used).
As well as the likelihood of the suspended sentence being activated in the event of further offending, it is also likely to be activated in the event that the requirements are not complied with. So it is a little harsher than a community order in that a suspended sentence is automatically available for imposition in the event of further offending or breach of the requirements.
Before imposing a suspended sentence the judge or magistrates must be sure that the offence is so serious that it could attract an immediate custodial sentence.