Paul, I'd very quickly rethink using the estate car.
You'll never get the machine in one without putting it on it's side, then there'll be 25 foot of 2 inch tube, a wand, buckets, chemicals, vacuum etc etc. Even if you do get half of that list into a car you'll going to look a right pikey turning up and unloading it. I've got a scorpian (same machine really) and a Mondeo (which is a large estate car) and no way without even trying will that lot get in there.
You need at least a small van