Desmond Hugh O'neill RAF information sought.

A family member is looking for information on Desmond Hugh O’neill. We don’t have his service number or any other details except he joined the RAF in July 1938 and was posted to 10 FTS Tern Hill. From there he was posted to 2 AACU Lee-on-Solent in October 1938.
We believe he was next posted to 611sqn followed by 41sqn at Hornchurch. Any additional information or where it could be found would be great. Thanks