Rear Washer leak - how do i remove estate trim?

i have sucessfully identified a leak on the washer jet pipe.

trying to use the rear wash wipe results in a pool of water by the rear left wheel and an empty screenwash tank soon after.

so

where exactly is this union, and how to i get all the prity bits off (including CD multichanger) to get to the broken union?

just dont fancy breaking things pulling them off.