These belonged to a family member and we have never used them, so have no experience of how well they work. They are quite a few years old. There is an instruction leaflet.
The lid of the blender has two chips in it (see photo) but we have tried it out with water and nothing splashed out.
Kenwood Blender and Mill (Northfields, Ealing W5)
This offer has been gifted to someone and is no longer available.