I knew that the terminals above were Entrelec/ABB so I did some digging. Those are 'ADO System® IDC technology' terminals and are IDC as someone suggested. There is a video on youtube on how to connect and disconnect, you do need a tooly thingy to connect and disconnect, but I reckon you could bodge something up with a bit of steel wire to do the disconnect.
https://www.youtube.com/watch?v=KAYfH_6MiIA