Boots the Chemist also sold office equipment back in the day (and music too, the first LP i ever bought was from the local Boots!) I have three Boots branded typewriters in the collection of which the PT400 is the latest to arrive. This is a very similar machine to the likes of the Silver-Reed SR10 and is in very good working order.
Interestingly, the machine came with it's manual which included details of when it was first purchased! That was in Cambridge in 1988. In the intervening thirty-six years the typewriter has been well cared for and still types as new.