On the 1st of May 2012 Nominet introduced the new feature: multi-year registration periods. With this feature .UK domain names can be registered and renewed for periods between 1 and 10 years by member registrars.
Read more about the new functionality on the Nominet website: Multi-year registration periods.
Parallels Automation products such as PBA and PBA-S do not need updates to support this feature, they are capable of registering and renewing .UK domains for periods between 1 and 10 years.
All that Provider has to do is to configure corresponding periods in plug-in settings in control panel.