If you visit car boot sales and see tools in boxes make sure to have a rummage as now and again you may come across a spanner used for the erection of Anderson shelters. Various companies made the shelters and so there are a number of differently-marked spanners out there. Below are six different ½ W (half inch Whitworth) spanners used for the bolts in Anderson shelters (½ W equals a 9/16 British Standard).
Photo Christopher Reynolds (Blacked Out Britain)
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