Stolen bikes

Yes you are stuck with it.

the wheel/frame lock is usually varied on what bike you have, some (like the Bob Jackson in the photo) have a closer clearance between the wheel and the seattube allowing enough room for the Fah to lock properly.

However some bike have a much larger clearance (those are usually design for mudguard), so the gap is greater between the wheel and seat tube, the other method is instead of locking the rear wheel + seat tube, simply lock the rear wheel + seat stay instead as it's easier (as displayed in the photo below).

my bike is the latter, the solution? I went for the longer version of the Fah; The M18

Great choice in tyre