Doggo restraint

I have a flat hair cookerpoo,  he's called Vimes, he's great. However when he is in the car he has to wear his harness and be clipped to an upper rear seatbelt mount for short journeys or for longer trips he has a cage that occupies two thirds of the back of the car. The cage is a pain to use as it eats so much space but it gives him room to move. His opinion on the harness is not for polite society, he manages to make me feel like the BORG every time I try to get it on him. So I was wondering about a cargo net behind the front seats that I could leave in place most of the time but is easy enough to remove if I need to through load something for work  but I can't find any info on if its considered suitable as a means of restraint? 

I got cargo nets both in the trailer and the rear of the jimny luggage compartment to stop my mess from falling out. Maybe those can be installed behind the front seats?
Bought on ebay but you might find them at halfords or similar places. many different sizes available.

In the rear of my SJ I had straps up in the ceiling that attached to my dogs harness. he could move around in the rear and turn around in a swivel but tight enough to stop him from jumping forward.
He was a 70cm tall sheboxweiler, German Sheperd/Boxer/Rottweiler mix. Just as crazy as the mix sounded but we where young and dumb.
Golden retriever and bernese mountain dogs only after that mishap.

I think your only solution is to buy an LCV which is all set up   and you get another Jimny which is a bonus. Sorry not very helpful. 

A Gen 4 would suit you Lambert, especially if James is offering one of his.

I don't say this often but you are both wrong. I'm quite happy with temeraire thank you so very much!

Keep temeraire and also have an lcv. Best of both worlds

So 3 jimny? That sounds a bit like getting my dogs dogs dogs dogs dogs dogs dogs dog a dog so they won't be lonely!

  Exactly. Look how happy these two are in their own LCV. What's better than 2 Jimnys, 3 Jimnys and so on and so on. You can just keep finding reasons to own more Jimnys and who doesn't want more Jimnys! I'm currently on the hunt for Jimny No.6 to join my fleet as my second daily to the daily to the summer daily to the second summer daily to the once in a while daily  

Aaannnyyyyyyywwwwwwwaaaaayyyy. Back to my question I have read the highway code on the matter and the advice is a harness, a cage/carry crate or guard the stipulation being that the doggo is unable to interact with the driver or be injured or a risk of injury I the event of a collision. What it doesn't indicate is what a guard might be made of nor how permanently it should be mounted?

I have a simple seatbelt clip that goes on to our Standard Poodles collar so to keep him from moving too much.  Generally just to either keep him in the rear or front, depending on where I want him to sit.  I do prefer him up shotgun beside me.

Although I have had many a journey with the rear soft top off and him sitting content looking out the back with no bother.