When he was tailgating you in an area he can't over take easily on, just do what I do.
Foot off accelerator, drop in neutral and at the gate for 2nd gear - if they go for the over take then whack it into 2nd and floor it.
Had this several times lately, and that always works. Last bloke to do it was someone fat idiot in a Vectra, did it to him which ****** him off completely and angered him more. Then on a dual carriageway later there was a lorry just pulling away on a green light just a head which then merges in turn into a single lane. I pulled along side the lorry and waited until the last minute to feed in front of him which left Mr Grumpy having to pull in behind him.
this is only ever going to work if you have a really fast car, and even then there is still a good risk of you getting run off the road, rammed, hit with a baseball bat etc...