Hi Rossella,
I would recommend to look for a genuine re-birthing practitioner via professional UK directories.
Here are a few sites where you can start looking:
http://www.healers.co.ukhttp://www.freeindex.co.ukhttp://www.embodyforyou.comor if you just type into google something like "healers professional directory Uk", you'll get more options to choose from.
Hope this helps.
Krisztina
http://www.involutiontherapies.com