I've found a used 2006 header tank on ebay for a reasonable price so will be fitting this in a couple of days when it turns up. New ones are around £180 and ECP seem to do one at around £80 but I was unsure if that was a pattern part or not so I went with a good used one in the end.
I've split the gearbox from the engine and have greased the clutch release fork arm a little where the slave cylinder goes so I hope this stops the creaking noise. I have also fitted the new release bearing, the old one was quite wobbly so I hope this to cure the other noise that was annoying me.
I'm happy to say I have no misting from either the RMS or IMSB seal.
The oil misting from around the AOS is worse than I thought and there are small puddles of oil on top of the crankcase fins, this must have been collecting for a while as it's like treacle. I'm still not 100% where this is coming from still but I wouldn't have been able to see this with the engine in situ.
I'll be able to see a little better once I drag the engine from under the car, the AOS is a job for Thursday and will take a bit of cleaning up in this area.
I may have also found why my AC keeps losing gas, the green O ring going onto the compressor has been crushed somewhat, there was no dye to be seen in this area but fingers crossed this is the reason.
One reason I like to do my own work, I can do other small preventative jobs that no paid mechanic would do and I cleaned up the oil pressure sender connections as they were starting to look a little corroded.
I have sent the CAT away to get the other Oxygen sensor out and chase the thread on the one I got out, should get this back on Thursday afternoon.