Tiger
I agree the sound is very unusual - which is what got me out of the car to try and find the aircraft as I had never heard the like before.
I am as sure as possible now that it was a 22 becuse the engines are so close inboard which struck me as unlike any I had seen before.
There is always a design choice with wing mounted donks - well out and the wing gets bending relief in the cruise but the asymm stuff gets worse.......
VP8
Perhaps 'mine' was the same one Tiger saw recently if yours is on jacks
Thanks again everyone
J