Rollator/walker with seat (Canvey SS8)

I’m housebound at the moment due to an ongoing knee injury. I can walk a few steps with a knee support but would like to be able to go further. If I had a rollator/ walker with a seat I could have a little rest when I’d walked enough. Something like the attached photo. I live on Canvey Island so would have to be nearby for me to arrange collection. Thanks for reading