Yesterday we were returning from Incleboro Fields CC Site in Norfolk back to Essex. I had just entered Essex heading towards Colchester on the A12. The cruise control was set at bang on 60. I noticed I was very slowly gaining on a small car up ahead. I like to leave a good distance between me and the car infront espeacially when I am towing, a good job I did. For no aparent reason he suddenly slowed from just under 60 down to about 40 mph. My choice was to slam on the brakes and risk a rear end smash, or swerve out into the next lane to go past. Fortunatley nothing was coming so I over took. As I went past I glanced accross to see this idiot with his head stuck in his mobile phone, obviously reading or writing a text. Had I been one of the tail gateing variatey such a sudden deceleration could've caused a serious accident. With all the publicity about the ban on mobiles when driving. this incident really made me appreaciate how right the ban is. It's a pity there arn't a few more police about to inforce it.