took the rear clam off yesterday to tackle a few jobs over winter. (along with a few upgrades i would suspect)

used the guide on here, very good. would have taken me a lot lot longer without it!
anyway. while pottering about i noticed an oil leak from this thing

looks like its coming from the hose rather than the plastic box thing (no idea what it is - crank case ventilation maybe?)
is it a well known fault with a simple fix or is it a new hose jobbie?
alsoooo
the oil filter area seems to have a bit of a coating of oil

in particlar the banjo bolt and pipe furthest away. is this the same hose as pictured in the first picture?
thanks, andy