One-in-nine nurseries in Kensington and Chelsea was below standard at the end of the last school term, analysis of Ofsted figures has shown.
According to the education watchdog, 10.7% of nurseries, pre-schools, before and after school clubs and holiday schemes in the borough "required improvement" or were "inadequate" as of August 31 2016 - one of the highest proportions in England.
One nursery was rated as inadequate, while another five were said to require improvement.
However, some establishments have since been recognised by Ofsted for making improvements.
Elsewhere, nurseries in Ealing were the most likely to be rated as "good" or "outstanding " at 90.3%.
Ofsted gives schools one of four overall ratings following an inspection either "outstanding", "good", "requires improvement" and "inadequate".
Premises rated "inadequate" as of August 31 in west London:
- The Kidzclub at Mora Primary School in Brent (now closed).
- Les Petits Lutins School, St Joseph’s Church, Wembley (now requires improvement).
- Young Graduates Day Nursery, in Knowles House, Longstone Avenue, Brent (now closed).
- Step By Step Nursery, Bridge Avenue, Hammersmith (now requires improvement).
- Herga Opportunity Playgroup, at Northolt Road Communal Hall, Northolt Road, South Harrow (now good).
- The Old Rectory Nursery School in Church Road, Cranford, Hounslow (now good).
- Oglon Day Nursery in Kensal Road, Ladbroke Grove.
- Fit For Sport Kids Camp At St Christina’s School in Saint Edmunds Terrace, St John’s Wood.
- St John’s Wood Adventure Playground, Westminster.
- Hyde Park Village Nursery School in Craven Terrace, Westminster (now requires improvement).
Among the outstanding childcare providers were Barlby Care Centre, based at Barlby Primary in Ladbroke Grove , Little Learners Nursery in Wembley, Honeypot Pre-school in Stanmore, Little Dragon Playgroup in Brentford, Stepping Stones Nursery School in White City, Ruislip Methodist Playgroup, Little Angels Day Nursery in Ealing and Queens Park Community Nursery.
Across England, as of August 31 2016, the proportion of providers on the EYR (Early years Register) judged to be good or outstanding was 91%.
This is up from 86% as at March 31 2016 and up from 74% since August 31 2012.
London showed the largest improvement of all the regions.
As at March 31 2016, London had 87% judged good or outstanding, rising up to 94% at the end of August 2016.
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