Local Taxi Service EXPRESS DELIVERY Paid 1/9d.+ ___ - Need ID

[Pocket Change]

Sheet Block of 4 that are perforated around each stamp with full gum on reverse.
Appreciate any help on Identification.

 

Amazon Forum Fav 👍

Diving for Pleasure and Treasure - Grab it through Amazon!

[jspero]

I have never seen these before. Maybe something to do with this?

GB Inland Express/Special Delivery Rates 1891-1993