I do searching as I find backing up your posts with figures is better than assuming or posting what you think is right. I may not get it right all the time and I accept it when I'm shown I'm wrong with evidence to back it up rather than " your wrong and look yourself as I'm not showing you "
I get a little cheesed off with some who keep saying things are banned when in fact they are not . Pin tail combs and Snorkel jackets are two of those

.
I don't think you will find a true figure as they won't be able to identify what bladed instruments are used in all crime's.
A little search finds this , I have just skimmed through it , some one else can read it all if they like .
There is a thing called the 4 A's
When analysing the types of knives being used in your local area,
consider the four ‘A’s.
Availability – how prevalent are different knife types in the
community?
Attractiveness – what features of a knife make it attractive
to users?
Affordability – how much resource does it take to acquire a
particular knife type and what are the associated costs in doing so?
Accessibility – what restrictions are in place to prevent access to
knives and how effective are they?
Availability
Unlike firearms, knives are in most homes, are in many workplaces
and can be legally purchased online. Although legislation has banned
some knife types and, in doing so, has reduced their availability,
domestic kitchen knives and craft knives are ubiquitous.
But availability alone cannot explain the observed patterns in the types
of knives that are carried or those used in violence. Knife use for
criminal purposes is also affected by attractiveness, affordability and
accessibility, which if altered may increase or decrease the likelihood
that someone might use or carry a particular knife
Attractiveness
Although knives have high availability, many have features that mean
they are not well-suited for use in violence. These features may
be practical, such as having too small a blade to cause damage or
lacking a guard that protects the user from accidental injury. Features
that make a particular type of knife attractive can also be aesthetic:
more menacing-looking and less available knives often have higher
status or are more effective in threatening people, while more
readily available knives and less dangerous knives have lower status.
Consequently, it is not inevitable that someone will carry a kitchen
knife just because a more attractive weapon is less accessible.
Affordability
Acquiring different types of knives have different costs, and these
costs are both financial and (potentially) punitive. At one end of the
spectrum, a kitchen knife in a person’s home has high affordability
but there are consequences of being found in possession of one
outside the home. At the other end of the spectrum is an illegal
or rare knife, such as a ‘zombie knife’, that is more expensive and
has higher punitive costs. It is therefore important to balance
attractiveness and availability with affordability. An implication for
problem solving is that an expensive weapon with low affordability,
such as a zombie knife, is less likely to be discarded in a park or a
knife bin. When their availability and attractiveness is high, an illicit
market or loan system for these knives may also emerge.
Accessibility
Although a particular knife type may be readily available in shops
or from online retailers, there are often restrictions in place to limit
how easy it is for a person to access them. In shops, this might
be security restrictions to prevent the knife being stolen, policies
around age restrictions or keeping knives behind a counter. In
online retail, the Offensive Weapons Act 2019 has extended these
restrictions to doorstep deliveries. Outside of retail accessibility,
situational interventions like knife arches can significantly reduce the
accessibility of a knife to certain premises
In producing this guidance document, we examined the types of
knives used in fatal violence in London in 2019/20.
Informed by the
four A’s framework (attractiveness, availability, affordability and
accessibility), we found that the attractiveness of certain knives,
such as machetes, appears to outweigh the difficulties of sourcing
them (availability and accessibility) or the risks of being arrested
in possession of them (affordability). In the image below, the size
of each circle shows how often a particular type of knife featured
in murder in London in 2019/20. The width of the line connecting
the circles represents how frequently two types of weapons were
used in the same incident, thereby indicating group violence. The
image tells us that specialist knives are indeed a serious problem in
London (at least over the period analysed) and that group violence
tends to involve multiple specialist knives.
Therefore, tackling the
availability of these types of knives in an effort to reduce knife-
related violence is a logical response.
View attachment 549735
As you can see, Machetes and the large combat type seem to be the go to choice in that area.
A kitchen Knife might be easy to get but it may not be what the people who carries knives want as a machete or the the " that knife again " type is more intimidating .
When you have shops like Anglo Arms who are seen as the first place to go when you want something that fits the 4 A's.
Police had a slogan " that knife again " when they were taking a certain type off people in stop and searches and so on.
It was the large black handled knife seen in pics below that was almost always shown.
According to several articles, Police where finding one brand of knife more than others . Anglo Arms
Malcolm Mide-Madariola, 17, was knifed to death outside Clapham South tube station in November
www.mirror.co.uk
They said they were going to stop selling them
EXCLUSIVE: The arms company has stopped selling the 15in knife police keep finding on thugs
www.mirror.co.uk
Over the last few days . Notice what knife they were carrying ? Yep "that knife again "
View attachment 549760View attachment 549761
This guy takes Knives off the streets . Anglo Arms knives is the brand he gets a lot .
Watch the video on X
A few of the "that knife again " ones here from the above video
View attachment 549785
others from the video.
View attachment 549784
Look at what he has taken off the streets and handing in. He does hand in Kitchen knives too for all of those who say he is only showing certain ones .
Some will say the above is fake but that's up to them .