Phil, estate agents definitely aren't 'all the same', the one we used for our purchase was/is absolutely excellent.

As Viking says property prices will reflect what is required from them.  A property of 10 hectares isn't necesarily going to be worth 10x more than one of 1 hectare. A property that has a proper 'habitation' for reformation is going to be worth more than one that just has a little almacen on it but lots of land.