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This is not the same as the 'Must remain an airfield' clause you are quoting. Kenley is a special case where the land is common land and owned by the City of London Corporation.
If MoD leaves, the site reverts to the City Corporation and also reverts to Common Land.
Not for development purposes.
Many years ago the Corporation actually proposed a museum on the site (including rebuild of the Hangars and it was stopped by the MoD. Possibly this could be resurrected if the site reverted back.
After all, the City Corporation has more money than you can shake a stick at............
Arc