Where can I find a replacement lid for a Roca dual flush cistern?

Greetings, recently my wonderful wife dropped her glass purfume bottle and on its way to the floor of the bathroom it managed to take a significant chip out of the lid of our Roca Dual Flush Cistern lid.

Unfortunately the chip was never recovered and I am hoping to be able to replace (or repair maybe?) the lid (not the wife as yet!).

If anyone knows where I might find such a replacement then I would be most grateful.