Whats happening with this boy now?

I would say that if you were dead set on rehoming him, I would have him, but I can't due to the fact I think if I bring another male in, my eldest will probably pack his bags and go to Dogs trust himself...

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As many have mentioned already, hoarding and possessiveness over toys is usually a sign of attention seeking. For example if your dog steals something and you run around the house shouting he then thinks he's getting the attention he wants. Like children, even negative attention is attention.

Destructive behaviour is commonly associated with boredom and anxiety, working dogs need to be mentally stimulated as much as physically.

A lot of people have also mentioned weighted backpacks, this is the first I've heard of this, any idea where I can get them??

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On ebay are cheap. I have this type of backpack.
I started walking him with a backpack when he was 6 months old, without any weight and I put weights gradually. It helps a lot when I don't have enough time to walk him (30 minutes instead of 1 hour).

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Festus & Anca
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Don't assume...ask

3 Peaks Terrain Pack Harness | Pets at Home

with bean cans in!!

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In context you describe; yes grabbing something and running around the house with it is usually attention seeking. Dogs are a highly intelligent and social species.
I actually play this as a game with my dogs- first with toys, on verbal cue of "get [insert dog's name]"- however I also have a retrieve or drop on verbal cue (which I can reward of another game of "I'm going to get you!" - fun )

However you are incorrect when you say that possessiveness (and I assume you are referring to resource guarding too) is associated with attention seeking. On the contrary resource guarding and possessiveness is usually fuelled by anxiety and fear of a prized resource being taken from them. It is a perfectly normal, evolutionarily adaptive behaviour, which unfortunately is often triggered in urban life.
With a dog that is possessive or resource guarding. Emphasis should be on counter-conditioning his emotional response to the presence/proximity of people/other dogs around prized objects and teaching him a game such as swaps, which initially avoids conflicts and eventually becomes a really fun game.

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Stimulate the brain as well as the body. He sounds a lot like one of my springers, who is not an easy dog and needs more doing with him than others. Train, train and more training-tricks, agility, search, retrieval, all help to tire my mad one out. He loves the games and will be tired out in the evenings (but still nicks stuff for attention )

If you're not coping, then maybe yes, re-home. I don't have kids, so I'm lucky not to need to worry about guarding behaviour etc. Good luck with whatever you do.

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Transplanted Geordie
RIP Jake, my best dog. 10.8.10
RIP Boomerang, beautiful horse. 27.5.08