I too recently got my CPL this year under the old CAA system.. I was told that although UK national licences are still being issued, the CAA's plan was to phase them out over the next few years; thereby when you go to renew your licence in 5 yrs time, you will be given a JAR licence.
Obviously, if the CAA were still issuing ten year licences, it would be much longer for them to be able to phase out all UK ones.