Compare 1 price for Wessex White Coaxial Outlet 1 Gang Satellite — from £1.95 across 1 UK seller including Toolstation.
These are simply a dual female f type connector designed for linking two cables mounted on a faceplate.
The description and photos do not show this.
You would need a very deep back box and a terminated cable to plug into the back to make any use of this.
Unfortunately it will have to go back and be swapped for an actual faceplate. Wish I'd checked properly before leaving the store.