Straight forward sashlock fitted with spindle and handles. Apart from the 4 retaining screws on each handle, there is nothing to hold it together. a good tug should remove them - try JohnD's suggestion of tapping the handles with a hammer to loosen them. Once loose, remove the handles, but leave the spindle in place and use this to lever the lock out of the mortice. Once the lock starts to move, remove the spindle and gently prise the lock out with a screwdriver.
The sashlock doesn't look to have a separate faceplate, so it won't pull off/out until the spindle has been removed.
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