AIRTHRIE Discovering Individual Excellence We are a co-educational, independent day school for children aged 3 to 11 years located in the heart of Cheltenham 27-29 Christ Church Road Cheltenham 01242 512837 airthrie-school.co.uk GL50 2NY %3. AIRTHRIE Discovering Individual Excellence We are a co-educational, independent day school for children aged 3 to 11 years located in the heart of Cheltenham 27-29 Christ Church Road Cheltenham 01242 512837 airthrie-school.co.uk GL50 2NY %3.