No not at all mate. Read this for a little more info:
"For a paintball marker to be classed as an "Air Weapon" and therefore not require a licence it must not be fired above 12 ft/lbs for a “rifle” type and 6 ft/lbs for a “pistol” type. Nearly all paintball markers come under the “rifle” type, only markers like the “splatmaster” come into the “pistol” category. If a marker fires above these limits they will then come under the Firearms Act and require a licence or be classed as a prohibited weapon. The recent amendment included carbon dioxide as an approved propellant previously only compressed air was allowed. Paintball markers must also only fire approved paintballs. Paintball markers must not be fully automatic i.e. when pulling the trigger once, two or more paintballs must not be discharged.
To stay within the law a paintball marker must not be fired above 330fps when using an average weight paintball, this equates to 12 ft/lbs. All tournament markers are restricted to a maximum velocity of 300fps, which equates to 9.9ft/lbs and site markers should be used at between 250-280fps to be safe for customers. This equates to 7ft/lbs-8.7ft/lbs. "
Aslong as you are firing 280 which we all do and using paintballs you do not need a license