Cable from engine bay to interior cabin.

[Tikki]

Berlingo 2020 130hk automatic left hand drive. 

Take out the top glowebox 5 torx screws.
Inside you see a white box. This is the box the air blower fan is mounted. 
Take out the plastic plug twist 45* and pull out. 

Take off the grill under the windscreen. 
Now you have a place to pull the cable throug the firewall

[boop]

If I had any plans on keeping my Berlingos longer than warranty period I would go with this idea.

[Cumbrian]

Looks useful but is there an equivalent plug on right hand drive vehicles? Is it in the same place?

[Tikki]

I would think so.
The housing should be the same, or mirrored on the other side