I would like to recommended Scan Clinic Studio in Erith (opposite Farm Foods) to all you mums to be that are interested in a gender or 3d/4d scan. I sat in on my sisters gender scan yesterday (she is 17 weeks pregnant) and it was such a lovely experience.
Anu, the sonographer was lovely and took her time to not only tell us the sex of the baby but also check all the measurements of him to reassure my sister everything was going well. She even got a peek of him in 4d which was so lovely to see. I remember when I went for my gender scan they wanted an extra £20.00 to show me my baby in 4d so this was a pleasant surprise.
They have a facebook page - Scan Clinic Studio.