WaterPik dental flosser - mains (Top Amersham HP6)
Similar to this image. It is a few years old but works perfectly. There are eight different attachments for cleaning between the teeth and tongue. There are three separate heads for jetting between the teeth, for different family members. It has a dial to adjust the force of the water. It has a two pin plug for use in bathrooms, so you may need an adapter if you want to use it elsewhere.
This offer has been gifted to someone and is no longer available.