Looking for Mosquito call sign Coleby Grange

Hello everyone,

got referred by a good friend of mine to this forum.

In my hometown a Mosquito crashed due to colliding with trees, on turn around for a second straving of a train standing at a station.

The crash happened on the 10th of April 1941 and took the lives of two young brave Canadians, who are since buried at our local cemetery.

What I do know is that the crew comprised out of:

F/O Bull (radar) and F/O Leach (pilot) of the Mosquito NFII, it had serial DZ743 and was stationed with 410sq RCAF at Coleby Grange.

Therefore making it call sign RA-

Was wondering if someone can piece the complete call sign together...

Any help would be greatly appreciated.

Best regards,

Jan