help -- loose/wobly UPVC door handle

[DIYNOTUSER]

handle to my UPVC door to back garden has gone loose . it has quite a lot play in it . when i checked it is not a normal handle . ( where two screw to take out handle and spindle) . it has one small screw inside of handle which tighten handle on spindle.I used l key to open it which is causing whole problem and that has gone loose on spindle .
i planning to replace whole handle unit but not sure how i can remove it . tried every bit ( removed lock and other screws) but spindle is not coming out

one more thing spindle is not square one it looks like round extension fitted on square one

here are picture of spindle

 

[almeriasecure]

It looks like a failed lock.

You need a replacement.

I do not think that this type can be purchased from B&Q or Wickes.

If you cannot find an exact replacement then you realy should call a locksmith in because it could go pear shaped & cost more in the long run.