Possible scenarios include:
* Merger: The school may have merged with another school in the area, losing its individual identity.
* Closure and Redevelopment: The building might have been sold and redeveloped for a different purpose, such as residential housing or offices, common in urban areas like Kensington.
* Name Change: There's a small possibility the school changed its name and continues to operate under a different title, though less likely given the specificity of your question.
To find more definitive information, you would likely need to consult:
* Local archives: The archives of Kensington and Chelsea Borough Council might hold records relating to the school's closure or the building's history.
* Educational records: The Department for Education or other relevant educational bodies might have records of the school's existence and eventual fate.
* Newspapers archives: Searching historical newspaper archives (e.g., the British Newspaper Archive) for mentions of Allendale Prep School might reveal information about its closure.
Without more in-depth research into local archives, it's impossible to say definitively what happened to Allendale Prep School.