try
http://www.rha.net/hauliers-shop/plonearticle. 2006-04-12.3283709657
I just looked in my copy of Commercial Motor, as for the last couple of months Chartwell have had a full page ad in there, but guess what...not there this week!! If you have a Siemens VDO unit, you can get the stuff from their website
http://www.siemensvdo.co.uk/NR/rdonlyres/106AD B54-47F3-4CB0-ABCB-4D29723A330C/0/MotorTranspo rtAdvertSeptember.pdf
If you just have one lorry 'Solution 1' will be your option. The download keys are about �150 inc the software, so after the initial outlay of that, you just need the 'till rolls'.