It's possible you may find something in the Defence of Britain Database, a six year project for the Council For British Archeology it's found at the Archeology Data Service were it can be searched, the original Google Earth dataset has since been massively expanded by Steve Thompson who originally created it and can be found to down load on the Pillbox Study Group website Extended Defence of Britain Database
One of the alternatives is Gibsons Cut, (Tattershal canal) build seperately.
One of the alternatives is Gibsons Cut, (Tattershal canal) build seperately.
I have a book about the navigation if you want to borrow it Patrick.
They do come in a huge range of colours, & can be powder coated any colour you like, we use thousands of them at work.
I quite often have to show the low profile torx headed ones on drawings as Architects can be very fussy, one manufacturer does what they call an Irius head that has no drive hole in it, you need a special tool to fix those, but they do look better.
For those who may not know, Tek screws are self drilling and self tapping roofing & cladding screws, that come mostly with hex or colour moulded heads, but low profile are available.
Ones like below can aslo come powder coated to the appropriate colour.
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