You could always log on to adultwork/gumtree/viva street etc then use the search box at the top right hand corner of the screen to see if they have any reviews.
Agree, on AW you can refine your search so that it displays all those in northants, or within a specified radius of say xx Miles from NN1 or whatever post code you enter.
Then go thorugh those profiles, selecting those you like and adding them to your Hot List. then come on here and research them out. If you find no info, only then post on here asking for more info.