Hello
I am driving a 2.2 Diesel , manual and the brake fluid is leaking

I have found its leaking from the rubber seal under the part I have circled in red in the first image,,
is this the Clutch Slave cylinder ? is this easy to swap out, I cant find much

also in the second image , there is a small plastic bit sticking up ,, which appear broken ?

Any help even identifying what these are
Cheers



Cl