In order to get an injunction you will need to go before a Judge in the County Court. The Judge will hear the application and decide whether or not it is suitable to issue an injunction. At the first hearing the Judge will (more than likely) issue an interim order, followed by a further hearing to issue the injunction.
There is no fee for obtaining an injunction but there may be associated costs for legal advice. Legal aid is available for certain types of injunctions providing you meet the criteria but, it is not available for defending against an injunction. For details on how to apply, please see the link in 'Related Information' (you may wish to obtain advice and/or assistance from a solicitor, but this is not a legal requirement).
Injunctions under the Family Law Act 1996 as described above are not only available to ex partners, but there is also an extensive list of people classed as relatives and cohabitants that can apply. Co-habitants are couples who live together but are not married.
The National Centre for Domestic Violence can obtain injunctions for those suffering from domestic violence. You can also get advice on applying for an injunction from a charity, for example Refuge, Women’s Aid, Citizens Advice or ManKind - see 'Related Information' for further details.
You should report this behaviour to your local police force if either you or, your solicitor feel that it amounts to a criminal offence. In these circumstances an injunction may also carry a power of arrest.