I think you may have been given the wrong information. Perhaps you are thinking about a letter that is rumoured to have been sent out to ParcelForce account customers.
The current courier options from ParcelForce are :
ParcelForce Express 48 which is the only service operated that domestic, non account, retail customers are allowed to use and is limited to £100 compensation for air rifles.
L/H Pro-Target MK111 Burris Timberline 4.5-14x32 Ballistic Plex
L/H TX200HC Burris Fulfield II 3-9x40
L/H TX200 GinB
Why is dyslexia so difficult to smell?.