Sgt Bann's Battle of Britain 238 Squadron

[Jon]

Hello all,
Sorry for posting this again but i last placed it almost three years ago and although i got some responses none had the answer. Many new members have joined since then and more information will have been made available so i am hoping someone may now know.

This is the one main query i am desperate to get a result on so any information more than welcome.

On page 352 on The Battle of Britain Then and Now there is a letter from Sgt Eric Bann of 238 Squadron. It looks to be dated before August 7th and after Mid July 1940 and only states it was written on a Friday !!
Sgt Bann says he took off with the C/O and two other pilots and engaged some bombers over the sea. He says quite clearly that he was shot down into the sea and after a long swim was picked up and landed at Portsmouth.
I can find no record of this incident at all.
Who shot him down ? what Hurricane was he flying ? date etc.....
All help appreciated.

Thanks
Jon