I can recommend Valentina, too!
Emanuela was great, too; http://emanuelaredaschi.com/
She was based in Clapham South but I think she may have moved abroad - worth contacting her.
We had a newborn session with Emanuela, and a toddler session with Valentina.
There is also a baby and newborn photography association: http://www.banpas.co.uk/
I'd recommend going to a studio, unless you are absolutely sure that the light in your property will be adequate for a session.