First half of postcode:
Locate a postbox on the map (either using the yellow pins or by clicking on the map) using your local knowledge and pick which one it is from the list. All postboxes have their reference number printed in the bottom left hand corner of the front text plate, so do go and check that. Please only use the map to locate postboxes. By submitting, you agree to place the location you submit in the public domain.
Map from OpenStreetMap
A located and referenced postbox in this partial postcode (yay)
An unreferenced postbox or post office from OpenStreetMap (could be outside the partial postcode boundary, in which case you’llhave to find the right partial postcode to have the postbox appear in the list)
Flickr search for TW12 in the Postboxes by Postcode pool
Nearby postcodes: TW13, TW4 (NW) TW1, TW11, TW2, TW3, TW7 (NE) KT12 (SW) KT7, KT8 (SE)
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© Matthew Somerville