oil cooler and HFH connection

And it can't be unblocked?

Coolant lines that are blocked sounds like a lot of attention is needed to what's happening. Take the oil filter off, then a big socket removed the oil cooler (what the hose from hell is connected to). Give it some pressured air to clear through - or poke with small screwdriver - see what has blocked it and review what other flush aspects you do. Blocking at that point would have me looking at your cooling system more.

I found the name, coolant bypass hose, Need to find the part number
 

Could Ultrasonic cleaning (the same as for injectors) perhaps help to clean it out?
I have been told that this can be used to clean the oil passages, but not sure about the water passages.
 
 
 
 

Blocked by rust... When I first bought the car, the first thing I did was place all the cooling components such as thermostat, coolant and replace the radiator... it was just rusty water coming out.... I say it was blocked because of that... I flushed it before, but I assume it was too late as it had blocked it... So I plan on doing another coolant flush just to be certain

This could be an opportunity to swap to an oil to air type cooler in place of the factory oil cooler which would probably be more efficient and take some thermal load away from the cooling system. 

You would want to look at something like this, http://www.mrpltd.co.nz/product/oil-filter-relocation-combo/ from MRP that also has a thermostat inbuilt and this also allows you to relocate your oil filter.