Of course knives are accessible in houses. We are surrounded by potential weapons that could be used to injure or kill people.
Gardens and roadsides have stones in them, especially in the countryside. These can and are used to hit people. We need to remove all the paving slabs, gnomes, garden ornaments from our environemnet. You do not even need to get into someone's house to access them.
What about branches on trees?, bits wrenched off cars? Loose railings?
I fully understand why Rishi Sunak wants children to study maths until 18. Those two extra years could be used to teach children the rules of probability and its practical application. We have a chain saw. Someone could get into the house, charge the battery, which is in the utility room, put it in the saw, which is in the garden shed, kept in a black polythene bag, start the motor and then kill me by decapitating me. On the other hand, he could break in through the front door and just hit me with a chair.
But what is the probability of anyone doing any of these things? The same applies to kitchen knives, craft knives, screwdrivers, rolling pins etc etc etc. I am not going to live in a home that consists of nothing but padlocked cupboards and inaccessible belongings, just because there is a chance in one - two - three million that someon might break into my house, search for a knife and kill me.