Less successful in its Ofsted inspection was Finchley Reform Synagogue Kindergarten, which dropped from its "outstanding" rating to "inadequate" - the lowest possible rating.
Inspectors said: "Leaders and managers have a poor understanding of their roles and responsibilities to protect the welfare of children. They have not ensured that some committee members are suitably vetted."
In order to improve, the nursery had to "make sure effective systems are in place to check the suitability of all staff and committee members".
But despite the rating, Ofsted concluded that "all children make good progress from their starting points".
In response to the report, Catherine Levy, head-teacher at Finchley Reform Synagogue kindergarten, said: “The kindergarten has been fortunate to receive an 'outstanding' or 'good' grade for the last 15 years.
"In the most recent review Ofsted continued to recognise the extremely high quality of teaching and described the kindergarten as a 'stimulating, well-resourced and a vibrant learning environment' with children 'feeling a positive sense of belonging” and where they are 'articulate, inquisitive and love to learn'."
Rabbi Miriam Berger from the synagogue added: "any parent would testify that FRS Kindergarten is a wonderful environment for their child to learn and grow. Ofsted have picked us up on a couple of gaps in our paperwork which have already been rectified."
This article has been amended