Unfortunately, this is only about hospitalisations. Crimes involving knives/sharp objects have been going steady, with a slight increase last years, from what I can see, mostly focused around rapes :(
Source (uk parliament, confirming numbers about hospitalisations): https://researchbriefings.files.parliament.uk/documents/SN04304/SN04304.pdf
Unfortunately, this is only about hospitalisations. Crimes involving knives/sharp objects have been going steady, with a slight increase last years, from what I can see, mostly focused around rapes :( Source (uk parliament, confirming numbers about hospitalisations): https://researchbriefings.files.parliament.uk/documents/SN04304/SN04304.pdf