Replacing main lights throughout house
The real question is the rating on that terminal block.  Is it rated for bare stranded wire?   If so, just discard the ferrule (that's a ferrule), strip the wire back and go.

Fixture makers are required to supply those things on new CE rated fixtures, and I can see where they play well with Euro style terminal blocks. It's not clear to me whether the installer is required to use them; if so, that would be "basics" and every shop would sell the ferrules and correct crimp tool. 

In America, we just cut them off.  I get fixtures all the time from China with very flimsy ferrules, and they are incompatible with our primary splicing method: the wire-nut.