Hi Annette, Ray has definately given you the best route if you are not familiar with the area. We live between Longleat and Bath and have the same dilemma everytime we set off north! At least being locals we know one slightly hair-raising route that we can manage through Bradford-on-Avon and then on bypassing Bath to the M4, but it would be hard to direct anyone through it. The Chippenham exit is very straightforward and the main HGV route! Have a good time!