Went out this morning and removed air filter housing ,sure enough the pipe had come apart at the joint just before it goes through the bulkhead housing. Its back together all fine now.

I had normal pressure on the front washers and low pressure in the rear washer. 

 

Checked the rear washer first becuase I thought it may be disconnected. 

Remove the tailgate trim and you can see into the back of the taillight and check if the 90° hose is connected/disconnected.

 

Mine was connected.

 

Next I put the rear washer on for a few seconds. Looked into the engine bay and 

it was covered in liquid so this is where the problem is. 

 

Found the hose that was partially disconnected and just reconnected it with my hand. 

 

 

Now i get full pressure on the rear washers. 

 

Hope this helps someone. 

 

Nice vid, thanks for posting.

Particularly impressed by the camera work under the bonnet.