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The school worked closely with the girls' grammar school, Lord Digby’s, and in later years each school provided distinct areas of expertise and adopted a co-educational approach for pupils from both schools for “A” level studies.
Although both schools were small, educational standards were high.
In 1987, it was announced that both Foster’s School and Lord Digby’s School would be closed and incorporated into a comprehensive with St Aldhelm’s school.
In 1992, the schools were closed and a new school, The Gryphon School, was created on the site of the old St Aldhelm’s. The Foster’s site at Tinney’s Lane and all of the property associated with the school were sold off for housing development, the school being commemorated by the naming of the main estate as “Foster’s Field”.