Using the RAC route planner is pretty easy and simple. The first step is to open up your internet browser such as Internet Explorer, Firefox or Safari and type in the following http://www.rac.co.uk/route-planner/. Once you have done that you should see something similar to the image below this will then allow you to input your journey details:
Thats it you are done. Now you will get to see how much miles your journey is and the best route. You can also find out the cost of fuel for your journey via the fuel costs tab.