Z4M engine - major oil leak (can't diagnose myself)

[GroundEffect]

Driving home tonight from the car wash I noticed my car was down on power - it wouldn't pull to pass another car. I then noticed that the idle very erratic at a junction and pulling away again it wouldn't rev passed about 2000rpm.

After another half mile (I was getting very close to home - I just wanted to get it back to take a look) some oil started burning on the exhaust and putting smoke out the back. By the time I got it home, this was the mess under the engine:



It's completely drained of oil now - most of it lost on the driveway and the following is what I've managed to work out:

- Engine Oil Cooler is intact and free of oil
- Engine Oil Pipes are intact and also clean
- The leak is limited to the driver's right hand side and in the O/S/F wheel arch
- No EML/K light came on when driving back
- I can't see any visible holes or gouges

What I need to know is:

A) What components are on the RHS of the engine?

B) A good garage local to Basildon, Essex that could come pick up the car and diagnose

Help

[TotalZ4]

Pressure relief valve at the back of the block.

[GroundEffect]

Googling the CPV, it appears to be associated with smallish leaks. Would its failure cause basically ALL the oil to be lost?

[isleofthorns]

how high up is the leak.. have you checked the vanos?