Cambridge Audio Edge w top removal?

Intriguing question with no fast answer from the net 🙂

But the four holes on top under the cover are longitudally extended which indicates that the cover should be slided in the back-forward direction.
And there are two recessed screw heads visible on the photos of the back panel which leads to the idea that perhaps these screws are pushing the top cover to its forward and fixed position? Or pulling it towards the rear panel...