I presume the reference to gun violence means you're comparing the UK to to US. This is nonsense, gun violence hasn't been "replaced" with stabbings - the UK homicide rate (by any means) is a sixth of the US's - 1.2 per 100,000 people for the UK vs 6.3 per 100,000 people for the US. [0]
Not only that but the US has a higher rate of knife murders than the UK. The US had 1739 homicides by knife or other cutting implement in 2020 [1], or 0.52 per 100,000. The UK had 235 knife murders in the year ending in March 2021 [2], or 0.35 per 100,000.
[0]: https://en.wikipedia.org/wiki/List_of_countries_by_intention...
[1]: https://www.statista.com/statistics/195325/murder-victims-in...
[2]: https://www.ons.gov.uk/peoplepopulationandcommunity/crimeand...