Found this in the corner of the lounge as we have not used it in ages.
It has a number of options for different massages and can include heat if you want it. (The massagers have a red light when heated).
Pictures show it on a settee but you can also use it on an upright chair - there are straps to make it secure (last picture)
Heated back massager (West Bridgford NG2)
This offer has been gifted to someone and is no longer available.