In doing the N249 thang at the weekend noticed a nice amount of oil (old & new) around what I've now identified as the "suction jet pump" and associated pipework (part No.s 058133753B, 06A133782D etc). What is all this pipework under the intake manifold, between the head breather (Y) and oil filter housing and where is it likely leaking off?
Been recently looking at the awesome breather kit, but seeing this problem area can't for the life of me work out how it would fit in/around all this guff.

Anyone got any bright ideas?