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There isn’t really a valid reason to carry a zombie knife or machete, they are not really collectible, and in the urban jungle, likely only used for intimidation and violence.
Kitchen knives are legitimate kitchen tools, and you can’t really ban the sale of those. There is already an age check on blades of any type.
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Some machetes are collectible because they've been standard military equipment for ages, not as weapons but for clearing a path in jungle/forest. https://www.thebushcraftstore.co.uk/martindale-golok-british-army-machete---the-genuine-one-78-p.asp They're also widely used for camping and gardening. And every butcher uses them. https://www.s-staniforth.co.uk/specialist-woods/278-butchers-knife.html
Some zombie knives are collectible because they come under the heading of film/game memorabilia. They're usually very cheap, made of rubbish metal, but I suppose if you have ill intent they represent the best value, because you use them once, throw them away and you've only lost 30 quid. https://weaponsgalore.com/product-category/swords/end-of-days/
And if you're going to talk about machetes and zombie knives, it's logical to include bayonets, swords, axes, meat cleavers, scythes etc.
As you say there's already an age check. Some couriers provide this as an extra service for online sales....the recipient of the parcel has to show ID.
Here's a fairly collectible RAF machete. I've got a similar one but it's cheap and tatty https://theantiquescentreyork.co.uk/collections/gifts-under-500/products/a-world-war-11-royal-air-force-folding-machete
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How is this a comparison?
Having a machete for gardening or outdoor activities is perfectly valid. Roming the streets with a massive kitchen knife is not - even if it's made of white steel with a 15º angle.
I own 3 machetes. Two medium, one short. They all have sentimental value for a start and the two medium ones are used as garden tools (one left at my parents, one in my house). The short one is superfluous in fairness, but it still has sentimental value.
Here is my main one
This is all being thrown into focus by the campaign to ban zombie knives and machetes. What difference would this make if you can buy equally deadly kitchen knives? A couple of years ago I was 30 yards from a murder carried out with a machete. I'm certain the result would have been the same if the killer had used a big Sabatier. https://www.bbc.co.uk/news/uk-england-london-61607344