Hi all. I’m wanting to install a new window sill in the attached picture area. I’m just a bit confused and would appreciate help. The current sill is concrete blocks, so I’ll be installing the new wooden sill on top of this. I’ll also be removing the secondary glazing as seen in the pic. What’s confusing me is can I also remove the bar of pvc which is in front of the window (the one with the black squiggle on it)? I don’t know why this is there, and stops me from installing the new wooden sill up to the window. Also, any problems installing a wooden window sill on top of the current concrete blocks? Thanks!