Adstock (click on photograph to bring up bigger/better version).

adstock On a wellhead at Adstock, Bucks. Thanks to Michael Burgess for the photo.

Markings: "P" in a hexagon.

Manufacturer: Puteus.

adstock, 2017 Also at Adstock, Bucks. Thanks to John Hurst for the photo.

Markings: None.

Manufacturer: Unk.

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