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.

 

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[jspero]

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

GB Inland Express/Special Delivery Rates 1891-1993