It is interesting though, that it is a product from the UK. My first thought when I saw the add is that it reminded me of the public bathroom stations you find in some places in London. They are round like the shower in the add - and you put a coin in a slot at the door. The door opens and then it closes behind you. You have something like 4 or 5 minutes before the door opens again. The interior space contains a steel toilet without a seat and a sink. No toilet paper or paper towels. When you exit the unit the door closes behind you and the entire unit flushes. As in water swirls down the walls etc. Then the unit is ready for the next user to slip a coin in the slot.
Maybe this new shower is a take-off of the idea for the public units in London.