Looking for RAF pilot, only have last name, Gregor

Hello All,

I hope you gentlemen can help me find an RAF pilot.

He was a Czech pilot who flew for the RAF during WW2.
After the war he went back to Czechoslovakia, but fled when he heard about the persecutions of the “western hero’s”.
He settled in Canada.

His last name is Gregor.
His first name may be Jan, as his fathers name was Jan.

For those curious.
He is the son of my late grandfathers best friend.

Thanks

(my internet search resulted in nothing)