A moving story, Martin, thanks for sharing.
Pol, I have to agree with Shush, but I suppose it depends on what you do with it. If someone gets hold of, say, a rusty Nazi-related dagger as a piece of history then fine. If they regard it as something admirable and it fuels their fire then that's a problem... but how can that be regulated? And lets face it, a rusty British Army knife could be equally exciting to someone from the BNP...
Ideals, not relics, are what's dangerous... 
Yes, that's my point. For the record, I do not believe owning collectibles from WW2 or any war is banned in any country. Displaying Nazi images in banned in several countries, most rigidly enforced in Germany. However, some of the worlds most respected dealers in Nazi war collectibles are indeed in Germany, their market largely North America. The typical collector a middle aged well paid man who has a room where he keeps his collection to go and look at and usually mixed with items from other nations including their own. The collecting of war souvenirs as old as war itself. Even our own legendary Victoria Cross medal is made out of bronze from a Russian cannon captured at Sevastopol.
Pol, you may want to imagine a BNP or C-18 bullyboy is the market for war memorabilia , but for example a genuine SS helmet will set you back £2000- £15000 depending on its rarity and condition. If you want to gather with like minded nutters in someone front room and wear one, you can buy a good replica for £50.
If we are going to band artefacts from Nazi Germany, then we have to ban items from Communist Russia, Imperial Japan, and maybe even from our own British Empire. Banning antiques , I do not believe will have much effect on the state of mind of extremists around today, but if we do destroy all such items, maybe people will start to forget the past a little easier, and maybe start to deny it.
One of the rarest artefacts from the Nazi period is original arm bands which amongst others Jews were forced to wear. There are still some in existence -- should we burn them? The only ones I have seen personally were in the Anne Frank museum / Jewish centre in Amsterdam, The rise of Nazism Museum in Munich, and in several Museums in Warsaw. Burn em', why not,the far-right have elements that are convinced the holocaust never happened. - lets give em' a hand !!