An environmental charity has called on Boris Johnson to reject "totally inappropriate" plans for a school on green land in Hounslow .
Nishkam School West London was this month given permission by Hounslow Council's planning committee to build a school for 1,400 pupils on the old White Lodge sports ground in Osterley.
The decision needs to be approved by the Greater London Authority (GLA), headed by London Mayor Boris Johnson , before building can begin.
The Campaign to Protect Rural England's (CPRE) London branch has written to London Assembly member Andrew Boff urging him to persuade Mr Johnson to intervene.
"If the mayor does not intervene this sends a clear signal that councils can sacrifice special green spaces without difficulty, even where exceptional circumstances cannot be demonstrated, and that even the highest levels of land protections do not mean anything at all," wrote CPRE London's green spaces officer Alice Roberts.
The charity fears that if the planning permission stands it will set a precedent for building schools on green land across the capital, particularly given the anticipated demand for extra school spaces in London.
Ms Roberts said the development was "totally inappropriate" and the decision had ridden "roughshod" over protection for the Metropolitan Open Land.
She said CPRE was particularly concerned that the land had been bought by the Education Funding Agency (EFA), which finances new schools, before permission to build had been granted.
The charity, which recently produced a report on the threats to protected land arising from proposals to build new schools, said this "undermines public confidence in the planning system".
Hounslow Council has said the new school building will help meet the need for extra school spaces in the borough.
Nishkam School West London, which is a free school for pupils aged four to 18, opened at a temporary site in Isleworth in 2013.
Should its new premises be approved by the Greater London Authority, they are scheduled to open in September 2017.
